Document Outline
- FEATURES
- DESCRIPTION
- ORDERING INFORMATION
- INPUT AND OUTPUT LOADING AND FAN OUT TABLE
- PIN CONFIGURATION
- LOGIC SYMBOL
- IEC/IEEE SYMBOL
- LOGIC DIAGRAM
- FUNCTION TABLE
- ABSOLUTE MAXIMUM RATINGS
- RECOMMENDED OPERATING CONDITIONS
- DC ELECTRICAL CHARACTERISTICS
- AC ELECTRICAL CHARACTERISTICS
- AC WAVEFORMS
- TEST CIRCUIT AND WAVEFORMS
- PACKAGE OUTLINES
- SOT146-1
- SOT163-1
- SOT339-1
- DEFINITIONS
Philips Semiconductors
74F2244
Octal buffer with 30
equivalent output
termination (3-State)
Product specification
1994 Dec 5
INTEGRATED CIRCUITS
IC15 Data Handbook
Philips Semiconductors
Product specification
74F2244
Octal buffer with 30
equivalent output termination
(3-State)
2
1994 Dec 05
853-1525 14380
FEATURES
Octal bus interface
30
output termination ideal for driving DRAM
15mA source current
SSOP Type II Package
DESCRIPTION
The 74F2244 is an octal buffer that is ideal for driving dynamic
DRAM with matching impedance. The outputs are all capable of
sinking 5mA and sourcing up to 15mA. The device features two
output enables, OEa and OEb, each controlling four of the 3state
outputs.
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F2244
4.0ns
30mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
10%, T
amb
= 0
C to +70
C
DRAWING NUMBER
20-pin plastic DIP
N74F2244N
SOT146-1
20-pin plastic SOL
N74F2244D
SOT163-1
20-pin plastic SSOP Type II
N74F2244DB
SOT339-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS
DESCRIPTION
74F (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
Ian, Ibn
Data inputs
1.0/0.33
20
A/0.2mA
OEa, OEb
Output enable inputs (active low)
1.0/0.33
20
A/0.2mA
Yan, Ybn
Data outputs
750/8.33
15mA/5mA
NOTE: One (1.0) FAST unit load is defined as: 20
A in the high state and 0.6mA in the low state.
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 VCC
OEa
Ia0
Yb0
Ia1
Yb1
Ia2
Yb2
Ia3
Yb3
GND
SF00227
OEb
Ya0
Ib0
Ya1
Ib1
Ya2
Ib2
Ya3
Ib3
LOGIC SYMBOL
OEa
1
SF00228
2
4
6
8
17
15
13
11
18
16
14
12
3
5
7
9
Ia0
Ia1
Ia2
Ia3
Ib0
Ib1
Ib2
Ib3
Ya0
Ya1 Ya2
Ya3 Yb0 Yb1 Yb2 Yb3
VCC = Pin 20
GND = Pin 10
OEb
19
Philips Semiconductors
Product specification
74F2244
Octal buffer with 30
equivalent output termination
(3-State)
1994 Dec 05
3
IEC/IEEE SYMBOL
1
2D
EN1
EN2
1
2
19
2
4
6
8
17
15
13
11
18
16
14
12
3
5
7
9
SF00229
FUNCTION TABLE
INPUTS
OUTPUTS
OEa
Ia
OEb
Ib
Ya
Yb
L
L
L
L
L
L
L
H
L
H
H
H
H
X
H
X
Z
Z
Notes to function table
H = High voltage level
L
= Low voltage level
X = Don't care
Z = High impedance "off" state
LOGIC DIAGRAM
VCC
=
Pin 20
Ia0
SF00236
OEa
Ia3
Ia2
Ia1
2
4
6
8
1
Ya0
Ya1
Ya2
Ya3
18
16
14
12
Ib0
Ib1
Ib2
Ib3
OEb
17
15
13
11
10
2
5
7
9
Yb0
Yb1
Yb2
Yb3
GND = Pin 10
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free air temperature range.)
SYMBOL
PARAMETER
RATING
UNIT
V
CC
Supply voltage
0.5 to +7.0
V
V
IN
Input voltage
0.5 to +7.0
V
I
IN
Input current
30 to +5
mA
V
OUT
Voltage applied to output in high output state
0.5 to V
CC
V
I
OUT
Current applied to output in low output state
10
mA
T
amb
Operating free air temperature range
0 to +70
C
T
stg
Storage temperature range
65 to +150
C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
PARAMETER
MIN
NOM
MAX
V
CC
Supply voltage
4.5
5.0
5.5
V
V
IH
Highlevel input voltage
2.0
V
V
IL
Lowlevel input voltage
0.8
V
I
Ik
Input clamp current
18
mA
I
OH
Highlevel output current
15
mA
I
OL
Lowlevel output current
5
mA
T
amb
Operating free air temperature range
0
+70
C
Philips Semiconductors
Product specification
74F2244
Octal buffer with 30
equivalent output termination
(3-State)
1994 Dec 05
4
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST
LIMITS
UNIT
SYMBOL
PARAMETER
CONDITIONS
1
MIN
TYP
2
MAX
UNIT
V
CC
= MIN,
I
OH
= 3mA
10%V
C
C
2.5
V
V
OH
High-level output voltage
V
IL
= MAX,
5%V
CC
2.7
3.4
V
V
IH
= MIN
I
OH
=
15mA
10%V
C
C
2.0
V
5%V
CC
2.0
V
V
OL
Low-level output voltage
V
CC
= MIN,
V
IL
= MAX,
I
OL
= MAX
10%V
C
C
0.50
V
V
IH
= MIN,
5%V
CC
0.42
0.50
V
V
IK
Input clamp voltage
V
CC
= MIN, I
I
= I
IK
0.73
-1.2
V
I
I
Input current at maximum input voltage
V
CC
= MAX, V
I
= 7.0V
100
A
I
IH
Highlevel input current
V
CC
= MAX, V
I
= 2.7V
20
A
I
IL
Lowlevel input current
V
CC
= MAX, V
I
= 0.5V
0.2
mA
I
OZH
Offstate output current,
highlevel voltage applied
V
CC
= MAX, V
O
= 2.7V
50
A
I
OZL
Offstate output current,
lowlevel voltage applied
V
CC
= MAX, V
O
= 0.5V
50
A
I
OS
Shortcircuit output current
3
V
CC
= MAX
-60
-150
mA
I
CCH
20
30
mA
I
CC
Supply current (total)
I
CCL
V
CC
= MAX
45
65
mA
I
CCZ
26
40
mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25
C.
3. Not more than one output should be shorted at a time. For testing I
OS
, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal 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 parameter tests. In any
sequence of parameter tests, I
OS
tests should be performed last.
AC ELECTRICAL CHARACTERISTICS
LIMITS
T
amb
= +25
C
T
amb
= 0
C to +70
C
SYMBOL
PARAMETER
TEST
V
CC
= +5.0V
V
CC
= +5.0V
10%
UNIT
CONDITION
C
L
= 50pF, R
L
= 500
C
L
= 50pF, R
L
= 500
MIN
TYP
MAX
MIN
MAX
t
PLH
t
PHL
Propagation delay
Ian, Ibn to Yn
Waveform 1
3.0
2.5
4.5
4.5
7.0
7.0
2.5
2.5
8.0
7.5
ns
t
PZH
t
PZL
Output enable time
to high or low level
Waveform 2
Waveform 3
2.5
3.0
4.5
5.0
7.5
8.0
2.0
3.0
8.0
8.5
ns
t
PHZ
t
PLZ
Output disable time
from high or low level
Waveform 2
Waveform 3
1.5
1.5
3.5
2.5
6.0
5.5
1.0
1.0
6.0
5.5
ns
Philips Semiconductors
Product specification
74F2244
Octal buffer with 30
equivalent output termination
(3-State)
1994 Dec 05
5
AC WAVEFORMS
For all waveforms, V
M
= 1.5V.
V
M
V
M
V
M
V
M
Yn
Ian, Ibn
t
PLH
t
PHL
SF00231
Waveform 1. Propagation delay for data to outputs
V
OH
0.3V
V
M
V
M
V
M
Yn
t
PZH
t
PHZ
SF00233
OEn
0V
Waveform 2. 3-State output enable time to high level
and output disable time from high level
V
OL
+0.3V
V
M
V
M
V
M
Yn
t
PZL
t
PLZ
SF00234
OEn
3.5V
Waveform 3. 3-State output enable time to low level
and output disable time from low level
TEST CIRCUIT AND WAVEFORMS
tw
90%
VM
10%
90%
VM
10%
90%
VM
10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0V
0V
tTHL (tf
)
INPUT PULSE REQUIREMENTS
rep. rate
t
w
t
TLH
t
THL
1MHz
500ns 2.5ns
2.5ns
Input pulse definition
VCC
family
74F
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN
VOUT
Test circuit for 3-State outputs
DEFINITIONS:
R
L
= Load resistor; see AC electrical characteristics for
value.
C
L
= Load capacitance includes jig and probe
capacitance; see AC electrical characteristics for
value
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
tTHL (tf
)
tTLH (tr
)
tTLH (tr
)
AMP (V)
amplitude
3.0V
1.5V
V
M
RL
7.0V
SWITCH POSITION
TEST
SWITCH
closed
open
All other
t
PLZ
, t
PZL
SF000235
Philips Semiconductors
Product specification
74F2244
Octal buffer with 30
equivalent output termination (3-State)
1994 Dec 05
6
DIP20:
plastic dual in-line package; 20 leads (300 mil)
SOT146-1
Philips Semiconductors
Product specification
74F2244
Octal buffer with 30
equivalent output termination (3-State)
1994 Dec 05
7
SO20:
plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
Philips Semiconductors
Product specification
74F2244
Octal buffer with 30
equivalent output termination (3-State)
1994 Dec 05
8
SSOP20:
plastic shrink small outline package; 20 leads; body width 5.3 mm
SOT339-1
Philips Semiconductors
Product specification
74F2244
Octal buffer with 30
equivalent output termination (3-State)
1994 Dec 05
9
NOTES
Philips Semiconductors
Product specification
74F2244
Octal buffer with 30
equivalent output termination (3-State)
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.
LIFE SUPPORT APPLICATIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 940883409
Telephone 800-234-7381
DEFINITIONS
Data Sheet Identification
Product Status
Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Philips Semiconductors and Philips Electronics North America Corporation
register eligible circuits under the Semiconductor Chip Protection Act.
Copyright Philips Electronics North America Corporation 1994
All rights reserved. Printed in U.S.A.
(print code)
Date of release: July 1994
Document order number:
9397-750-05198
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