16-Bit Buffers/Line Drivers
SCCS028B - December 1987 - Revised September 2001
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
Copyright
2001, Texas Instruments Incorporated
1CY74FCT16444T/2
H244T
Features
I
off
supports partial-power-down mode operation
Edge-rate control circuitry for significantly improved
noise characteristics
Typical output skew < 250 ps
ESD > 2000V
TSSOP (19.6-mil pitch) and SSOP (25-mil pitch)
packages
Industrial temperature range of 40C to +85C
V
CC
= 5V
10%
CY74FCT16244T Features:
64 mA sink current, 32 mA source current
Typical V
OLP
(ground bounce)
<1.0V at V
CC
= 5V, T
A
= 25C
CY74FCT162244T Features:
Balanced output drivers: 24 mA
Reduced system switching noise
Typical V
OLP
(ground bounce)
<0.6V at V
CC
= 5V, T
A
= 25C
CY74FCT162H244T Features:
Bus hold on data inputs
Eliminates the need for external pull-up or pull-down
resistors
Functional Description
These 16-bit buffers/line drivers are designed for use in
memory driver, clock driver, or other bus interface applications,
where high-speed and low power are required. With
flow-through pinout and small shrink packaging board layout
is simplified. The three-state controls are designed to allow
4-bit, 8-bit or combined 16-bit operation.
This
device
is
fully
specified
for
partial-power-down
applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device
when it is powered down.
The
CY74FCT16244T
is
ideally
suited
for
driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162244T has 24-mA balanced output drivers
with current limiting resistors in the outputs. This reduces the
need for external terminating resistors and provides for mini-
mal
undershoot
and
reduced
ground
bounce.
The
CY74FCT162244T is ideal for driving transmission lines.
The CY74FCT162H244T is a 24-mA balanced output part that
has "bus hold" on the data inputs. The device retains the in-
put's last state whenever the input goes to high impedance.
This eliminates the need for pull-up/down resistors and pre-
vents floating inputs.
GND
Logic Block Diagrams CY74FCT16244T, CY74FCT162244T,
CY74FCT162H244T
Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
33
32
31
30
29
25
26
27
28
36
35
1
OE
34
SSOP/TSSOP
Top View
1
Y
1
1
Y
2
1
Y
3
1
Y
4
13
14
15
16
17
18
19
20
21
22
23
24
45
44
43
42
41
37
38
39
40
48
47
46
1
A
1
1
A
2
1
A
3
1
A
4
1
OE
2
Y
1
2
Y
2
2
Y
3
2
Y
4
2
A
1
2
A
2
2
A
3
2
A
4
2
OE
1
Y
1
1
Y
2
1
Y
3
1
Y
4
1
A
1
1
A
2
1
A
3
1
A
4
2
OE
GND
GND
V
CC
2
Y
3
2
Y
4
2
Y
1
2
Y
2
2
A
1
2
A
2
2
A
3
2
A
4
V
CC
GND
GND
3
Y
3
3
Y
4
3
Y
1
3
Y
2
3
A
1
3
A
2
3
A
3
3
A
4
GND
GND
V
CC
4
Y
3
4
Y
4
4
Y
1
4
Y
2
4
A
1
4
A
2
4
A
3
4
A
4
V
CC
GND
4
OE
3
OE
3
Y
1
3
Y
2
3
Y
3
3
Y
4
3
A
1
3
A
2
3
A
3
3
A
4
3
OE
4
Y
1
4
Y
2
4
Y
3
4
Y
4
4
A
1
4
A
2
4
A
3
4
A
4
4
OE
FCT162441
FCT162442
FCT162443
FCT162444
FCT162445
16244T
162244T
162H244T
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
2
Maximum Ratings
[3,4]
(Above which the useful life may be impaired. For user
guidelines, not tested.)
Storage Temperature ................................. 55
C to +125
C
Ambient Temperature with
Power Applied............................................. 55
C to +125
C
DC Input Voltage ........................................... 0.5V to +7.0V
DC Output Voltage......................................... 0.5V to +7.0V
DC Output Current
(Maximum Sink Current/Pin) ........................60 to +120 mA
Power Dissipation .......................................................... 1.0W
Static Discharge Voltage............................................>2001V
(per MIL-STD-883, Method 3015)
Notes:
1.
On CY74FCT162H244T these pins have "bus hold."
2.
H = HIGH Voltage Level. L = LOW Voltage Level. X = Don't Care. Z = High Importance.
3.
Operation beyond the limits set forth may impair the useful life of the device. Unless otherwise noted, these limits are over the operating free-air temperature range.
4.
Unused inputs must always be connected to an appropriate logic voltage level, preferably either V
CC
or ground.
Pin Description
Name
Description
OE
Three-State Output Enable Inputs (Active LOW)
A
Data Inputs
[1]
Y
Three-State Outputs
Function Table
[2]
Inputs
Outputs
OE
A
Y
L
L
L
L
H
H
H
X
Z
Ordering Range
Range
Ambient
Temperature
V
CC
Industrial
40
C to +85
C
5V
10%
Electrical Characteristics
Over the Operating Range
Parameter
Description
Test Conditions
Min.
Typ.
[5]
Max.
Unit
V
IH
Input HIGH Voltage
2.0
V
V
IL
Input LOW Voltage
0.8
V
V
H
Input Hysteresis
[6]
100
mV
V
IK
Input Clamp Diode Voltage
V
CC
=Min., I
IN
=18 mA
0.7
1.2
V
I
IH
Input HIGH Current
Standard
V
CC
=Max., V
I
=V
CC
1
A
Bus Hold
100
I
IL
Input LOW Current
Standard
V
CC
=Max., V
I
=GND
1
A
Bus Hold
100
A
I
BBH
I
BBL
Bus Hold Sustain Current on Bus Hold Input
[7]
V
CC
=Min.
V
I
=2.0V
50
A
V
I
=0.8V
+50
I
BHHO
I
BHLO
Bus Hold Overdrive Current on Bus Hold Input
[7]
V
CC
=Max., V
I
=1.5V
TBD
mA
I
OZH
High Impedance Output Current
(Three-State Output pins)
V
CC
=Max., V
OUT
=2.7V
1
A
I
OZL
High Impedance Output Current
(Three-State Output pins)
V
CC
=Max., V
OUT
=0.5V
1
A
I
OS
Short Circuit Current
[8]
V
CC
=Max., V
OUT
=GND
80
140
200
mA
I
O
Output Drive Current
[8]
V
CC
=Max., V
OUT
=2.5V
50
180
mA
I
OFF
Power-Off Disable
V
CC
=0V, V
OUT
4.5V
[9]
1
A
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
3
Output Drive Characteristics for CY74FCT16244T
Parameter
Description
Test Conditions
Min.
Typ.
[5]
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
=Min., I
OH
=3 mA
2.5
3.5
V
V
CC
=Min., I
OH
=15 mA
2.4
3.5
V
V
CC
=Min., I
OH
=32 mA
2.0
3.0
V
V
OL
Output LOW Voltage
V
CC
=Min., I
OL
=64 mA
0.2
0.55
V
Output Drive Characteristics for CY74FCT162244T, CY74FCT162H244T
Parameter
Description
Test Conditions
Min.
Typ.
[5]
Max.
Unit
I
ODL
Output LOW Current
[8]
V
CC
=5V, V
IN
=V
IH
or V
IL
, V
OUT
=1.5V
60
115
150
mA
I
ODH
Output HIGH Current
[8]
V
CC
=5V, V
IN
=V
IH
or V
IL
, V
OUT
=1.5V
60
115
150
mA
V
OH
Output HIGH Voltage
V
CC
=Min., I
OH
=24 mA
2.4
3.3
V
V
OL
Output LOW Voltage
V
CC
=Min., I
OL
=24 mA
0.3
0.55
V
Notes:
5.
Typical values are at V
CC
=5.0V, T
A
= +25C ambient.
6.
This parameter is specified but not tested.
7.
Pins with bus hold are described in Pin Description.
8.
Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample
and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting
of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter
tests, I
OS
tests should be performed last.
9.
Tested at +25C.
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
4
Capacitance
[6]
(T
A
= +25C, f = 1.0 MHz)
Parameter
Description
Test Conditions
Typ.
[5]
Max.
Unit
C
IN
Input Capacitance
V
IN
= 0V
4.5
6.0
pF
C
OUT
Output Capacitance
V
OUT
= 0V
5.5
8.0
pF
Power Supply Characteristics
Parameter
Description
Test Conditions
Typ.
[5]
Max.
Unit
I
CC
Quiescent Power Supply Current V
CC
=Max.
V
IN
0.2V,
V
IN
V
CC
-0.2V
5
500
A
I
CC
Quiescent Power Supply Current
(TTL inputs HIGH)
V
CC
=Max.
V
IN
=3.4V
[10]
0.5
1.5
mA
I
CCD
Dynamic Power Supply
Current
[11]
V
CC
=Max., One Input Toggling,
50% Duty Cycle, Outputs
Open, OE=GND
V
IN
=V
CC
or
V
IN
=GND
60
100
A/MHz
I
C
Total Power Supply Current
[12]
V
CC
=Max., f
1
=10 MHz,
50% Duty Cycle, Outputs
Open, One Bit Toggling,
OE=GND
V
IN
=V
CC
or
V
IN
=GND
0.6
1.5
mA
V
IN
=3.4V or
V
IN
=GND
0.9
2.3
mA
V
CC
=Max., f
1
=2.5 MHz, 50%
Duty Cycle, Outputs Open, Six-
teen Bits Toggling,
OE=GND
V
IN
=V
CC
or
V
IN
=GND
2.4
4.5
[13]
mA
V
IN
=3.4V or
V
IN
=GND
6.4
16.5
[13]
mA
Notes:
10. Per TTL driven input (V
IN
= 3.4V); all other inputs at V
CC
or GND.
11. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
12. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
=
I
CC
+
I
CC
D
H
N
T
+I
CCD
(f
0
/2 + f
1
N
1
)
I
CC
=
Quiescent Current with CMOS input levels
I
CC
=
Power Supply Current for a TTL HIGH input (V
IN
=3.4V)
D
H
=
Duty Cycle for TTL inputs HIGH
N
T
=
Number of TTL inputs at D
H
I
CCD
=
Dynamic Current caused by an input transition pair (HLH or LHL)
f
0
=
Clock frequency for registered devices, otherwise zero
f
1
=
Input signal frequency
N
1
=
Number of inputs changing at f
1
All currents are in milliamps and all frequencies are in megahertz.
13. Values for these conditions are examples of the I
CC
formula. These limits are specified but not tested.
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
5
S
Switching Characteristics
Over the Operating Range
[14]
Parameter
Description
CY74FCT16244T
CY74FCT162244T
CY74FCT16244AT
CY74FCT162244AT
CY74FCT162H244AT
Min.
Max.
Min.
Max.
Unit
Fig. No.
[15]
t
PLH
t
PHL
Propagation Delay Data to Output
1.5
6.5
1.5
4.8
ns
1, 3
t
PZH
t
PZL
Output Enable Time
1.5
8.0
1.5
6.2
ns
1, 7, 8
t
PHZ
t
PLZ
Output Disable Time
1.5
7.0
1.5
5.6
ns
1, 7, 8
t
SK(O)
Output Skew
[16]
0.5
0.5
ns
--
Switching Characteristics
Over the Operating Range
[14]
(continued)
Parameter
Description
CY74FCT16244CT
CY74FCT162244CT
CY74FCT162H244CT
Min.
Max.
Unit
Fig. No.
[15]
t
PLH
t
PHL
Propagation Delay Data to Output
1.5
4.1
ns
1, 3
t
PZH
t
PZL
Output Enable Time
1.5
5.8
ns
1, 7, 8
t
PHZ
t
PLZ
Output Disable Time
1.5
5.2
ns
1, 7, 8
t
SK(O)
Output Skew
[16]
0.5
ns
--
Notes:
14. Minimum limits are specified but not tested on Propagation Delays.
15. See "Parameter Measurement Information" in the General Information section.
16. Skew between any two outputs of the same package switching in the same direction. This parameter is ensured by design.
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
6
Document #: 38-00396-C
Ordering Information CY74FCT16244
Speed
(ns)
Ordering Code
Package
Name
Package Type
Operating
Range
4.1
CY74FCT16244CTPACT
Z48
48-Lead (240-Mil) TSSOP
Industrial
CY74FCT16244CTPVC/PVCT
O48
48-Lead (300-Mil) SSOP
4.8
CY74FCT16244ATPACT
Z48
48-Lead (240-Mil) TSSOP
Industrial
CY74FCT16244ATPVC/PVCT
O48
48-Lead (300-Mil) SSOP
6.5
CY74FCT16244TPACT
Z48
48-Lead (240-Mil) TSSOP
Industrial
CY74FCT16244TPVC/PVCT
O48
48-Lead (300-Mil) SSOP
Ordering Information CY74FCT162244
Speed
(ns)
Ordering Code
Package
Name
Package Type
Operating
Range
4.1
74FCT162244CTPACT
Z48
48-Lead (240-Mil) TSSOP
Industrial
CY74FCT162244CTPVC
O48
48-Lead (300-Mil) SSOP
74FCT162244CTPVCT
O48
48-Lead (300-Mil) SSOP
4.8
74FCT162244ATPACT
Z48
48-Lead (240-Mil) TSSOP
Industrial
CY74FCT162244ATPVC
O48
48-Lead (300-Mil) SSOP
74FCT162244ATPVCT
O48
48-Lead (300-Mil) SSOP
6.5
CY74FCT162244TPACT
Z48
48-Lead (240-Mil) TSSOP
Industrial
CY74FCT162244TPVC/PVCT
O48
48-Lead (300-Mil) SSOP
Ordering Information CY74FCT162H244
Speed
(ns)
Ordering Code
Package
Name
Package Type
Operating
Range
4.1
74FCT162H244CTPVC/PVCT
O48
48-Lead (300-Mil) SSOP
Industrial
4.8
74FCT162H244ATPACT
Z48
48-Lead (240-Mil) TSSOP
Industrial
CY74FCT16244T
CY74FCT162244T
CY74FCT162H244T
7
Package Diagrams
48-Lead Shrunk Small Outline Package O48
48-Lead Thin Shrunk SmallOutline Package Z48
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2001, Texas Instruments Incorporated
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