DATA SHEET
Product specification
File under Integrated Circuits, IC06
March 1988
INTEGRATED CIRCUITS
74HC/HCT640
Octal bus transceiver; 3-state;
inverting
For a complete data sheet, please also download:
The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
March 1988
2
Philips Semiconductors
Product specification
Octal bus transceiver; 3-state; inverting
74HC/HCT640
FEATURES
Octal bidirectional bus interface
Inverting 3-state outputs
Output capability: bus driver
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT640 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT640 are octal transceivers featuring
inverting 3-state bus compatible outputs in both send and
receive directions.
The "640" features an output enable (OE) input for easy
cascading and a send/receive (DIR) for direction control.
OE controls the outputs so that the buses are effectively
isolated. The "640" is similar to the "245" but has inverting
outputs.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
C; t
r
= t
f
= 6 ns
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
W):
P
D
= C
PD
V
CC
2
f
i
+
(C
L
V
CC
2
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
(C
L
V
CC
2
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
2. For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
-
1.5 V
ORDERING INFORMATION
See
"74HC/HCT/HCU/HCMOS Logic Package Information"
.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL
/
t
PLH
propagation delay
A
n
to B
n
;
B
n
to A
n
C
L
= 15 pF; V
CC
= 5 V
9
9
ns
C
I
input capacitance
3.5
3.5
pF
C
I/O
input/output capacitance
10
10
pF
C
PD
power dissipation capacitance
per transceiver
notes 1 and 2
35
35
pF
March 1988
3
Philips Semiconductors
Product specification
Octal bus transceiver; 3-state; inverting
74HC/HCT640
PIN DESCRIPTION
PIN NO.
SYMBOL
NAME AND FUNCTION
1
DIR
direction control
2, 3, 4, 5, 6, 7, 8, 9
A
0
to A
7
data inputs/outputs
10
GND
ground (0 V)
18, 17, 16, 15, 14, 13, 12, 11 B
0
to B
7
data inputs/outputs
19
OE
output enable input (active LOW)
20
V
CC
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
Fig.4 Functional diagram.
FUNCTION TABLE
Note
1. H = HIGH voltage level
L = LOW voltage level
X = don't care
Z = high impedance OFF-state
inputs
inputs/outputs
OE
DIR
A
n
B
n
L
L
H
L
H
X
A=B
inputs
Z
inputs
B=A
Z
March 1988
4
Philips Semiconductors
Product specification
Octal bus transceiver; 3-state; inverting
74HC/HCT640
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
"74HC/HCT/HCU/HCMOS Logic Family Specifications"
.
Output capability: bus driver
I
CC
category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
SYMBOL
PARAMETER
T
amb
(
C)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS
+25
-
40 to +85
-
40 to +125
min.
typ.
max. min. max. min.
max.
t
PHL
/ t
PLH
propagation delay
A
n
to B
n
;
B
n
to A
n
30
11
9
90
18
15
115
23
20
135
27
23
ns
2.0
4.5
6.0
Fig.5
t
PZH
/ t
PZL
3-state output enable time
OE, DIR to A
n
;
OE, DIR to B
n
44
16
13
150
30
26
190
38
33
225
45
38
ns
2.0
4.5
6.0
Fig.6
t
PHZ
/ t
PLZ
3-state output disable time
OE, DIR to A
n
;
OE, DIR to B
n
50
18
14
150
30
26
190
38
33
225
45
38
ns
2.0
4.5
6.0
Fig.6
t
THL
/ t
TLH
output transition time
14
5
4
60
12
10
75
15
13
90
18
15
ns
2.0
4.5
6.0
Fig.5
March 1988
5
Philips Semiconductors
Product specification
Octal bus transceiver; 3-state; inverting
74HC/HCT640
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
"74HC/HCT/HCU/HCMOS Logic Family Specifications"
.
Output capability: bus driver
I
CC
category: MSI
Note to HCT types
The value of additional quiescent supply current (
I
CC
) for a unit load of 1 is given in the family specifications.
To determine
I
CC
per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
INPUT
UNIT LOAD COEFFICIENT
A
n
B
n
OE
DIR
1.50
1.50
1.50
0.90
SYMBOL
PARAMETER
T
amb
(
C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS
+25
-
40 to +85
-
40 to +125
min.
typ.
max. min. max. min.
max.
t
PHL
/ t
PLH
propagation delay
A
n
to B
n
;
B
n
to A
n
11
22
28
33
ns
4.5
Fig.5
t
PZH
/ t
PZL
3-state output enable time
OE, DIR to A
n
;
OE, DIR to B
n
18
30
38
45
ns
4.5
Fig.6
t
PHZ
/ t
PLZ
3-state output disable time
OE, DIR to A
n
;
OE, DIR to B
n
19
30
38
45
ns
4.5
Fig.6
t
THL
/ t
TLH
output transition time
5
12
15
18
ns
4.5
Fig.5
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