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HD74HCT640/HD74HCT643
Octal Bus Transceivers (with 3-state outputs)
Description
Both the HD74HCT640 and the HD74HCT643 have one active low enable input (G), and a direction
control (DIR). When the DIR input is high, data flows from the A inputs to the B outputs. When DIR is
low, data flows from B to A.
The HD74HCT640 transfers inverted data from one bus to the other. The HD74HCT643 transfers inverted
data from the A bus to the B bus and non-inverted data from the B bus to the A bus.
Features
• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
• High Speed Operation: tpd (A to B) = 14.5 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 4.5 to 5.5 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Control Input Operation
G DIR HD74HCT640 HD74HCT643
LL B data to A bus B data to A bus
LH A data to B bus A data to B bus
H X Isolation Isolation
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HD74HCT640/HD74HCT643
G
Pin Arrangement
HD74HCT640
DIR
1
A
2
1
20
19
V
CC
Enable
A2
A3
A4
A5
A6
A7
A8
GND
10
3
4
5
6
7
8
9
(Top view)
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
2
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HD74HCT643
G
DIR
A
HD74HCT640/HD74HCT643
1
2
1
20
19
V
CC
Enable
Block Diagram
HD74HCT640
G
DIR
A2
A3
A4
A5
A6
A7
A8
GND
10
3
4
5
6
7
8
9
(Top view)
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
V
CC
A
V
CC
To 7 other inverters To 7 other inverters
B
3
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HD74HCT640/HD74HCT643
HD74HCT643
G
DIR
A
To 7 other inverters To 7 other inverters
V
CC
B
V
CC
Absolute Maximum Ratings
Item Symbol Rating Unit
Supply voltage range V
Input voltage V
Output voltage V
DC current drain per pin I
DC current drain per VCC, GND ICC, I
DC input diode current I
DC output diode current I
Power dissipation per package P
CC
IN
OUT
OUT
GND
IK
OK
T
Storage temperature Tstg –65 to +150 °C
–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V
±35 mA
±75 mA
±20 mA
±20 mA
500 mW
4
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HD74HCT640/HD74HCT643
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol Min Typ Max Min Max Unit V
Input voltage V
Output voltage V
IH
V
IL
OH
2.0 — — 2.0 — V 4.5 to
— — 0.8 — 0.8 V 4.5 to
4.4 — — 4.4 — V 4.5 Vin = VIH or VILIOH = –20 µA
4.18 — — 4.13 — 4.5 IOH = –6 mA
V
OL
— — 0.1 — 0.1 V 4.5 Vin = VIH or VILIOL = 20 µA
— — 0.26 — 0.33 4.5 IOL = 6 mA
Off-state output
I
OZ
——±0.5 — ±5.0 µA 5.5 Vin = VIH or VIL,
current
Input current Iin — — ±0.1 — ±1.0 µA 5.5 Vin = VCC or GND
Quiescent current I
CC
— — 4.0 — 40 µA 5.5 Vin = VCC or GND, Iout = 0 µA
+85°C Test Conditions
(V)
CC
5.5
5.5
Vout = V
or GND
CC
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
Ta = 25°C
Item Symbol Min Typ Max Min Max Unit V
Propagation delay t
time t
Output enable t
time t
Output disable t
time t
Output rise/fall
time
PLH
PHL
ZH
ZL
HZ
LZ
t
TLH
t
THL
— 13 18 — 23 ns 4.5
— 16 18 — 23 4.5
— 16 46 — 58 ns 4.5
— 16 46 — 58 4.5
— 17 43 — 54 ns 4.5
— 21 43 — 54 4.5
— 4 12 — 15 ns 4.5
Input capacitance Cin — 5 10 — 10 pF —
+85°C Test Conditions
(V)
CC
5
Page 6
24.50
25.40 Max
Unit: mm
1120
6.30
1
0.89
1.27 Max
2.54 ± 0.25
1.30
10
0.48 ± 0.10
7.00 Max
0.51 Min
2.54 Min 5.08 Max
Hitachi Code
JEDEC
EIAJ
Weight
7.62
+ 0.11
0.25
– 0.05
0° – 15°
(reference value)
DP-20N
—
Conforms
1.26 g
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Cautions
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copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party’s rights, including
intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
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products.
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