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HD74LS640 Datasheet

Octal Bus Transceivers

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HD74LS640
Octal Bus Transceivers (inverted 3-state outputs)
REJ03D0487–0200
Rev.2.00
Feb.18.2005
This octal bus transceivers is designed for asynchronous two-way communication between data buses. The device
transmit data from the A bus to the B bus or from the B bus to the A bus depending upon the level at the direction
control (DIR) input. The enable input (G) can be used to disable the device so that the buses are effectively isolated.
Features
Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74LS640P
DILP-20 pin
PRDP0020AC-B
(DP-20NEV)
P
HD74LS640FPEL SOP-20 pin (JEITA)
PRSP0020DD-B
(FP-20DAV)
FP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
Pin Arrangement
DIR 1
1A 2
2A 3
3A 4
4A 5
5A 6
6A 7
7A 8
8A 9
GND 10
20 VCC
19 Enable G
18 1B
17 2B
16 3B
15 4B
14 5B
13 6B
12 7B
11 8B
(Top view)
Function Table
Note:
Enable
G
L
L
H
H; high level, L; low level, X; irrelevant
Direction Control
DIR
L
H
X
Rev.2.00, Feb.18.2005, page 1 of 6
Operation
B data to A bus
A data to B bus
Isolation


Renesas Electronics Components Datasheet

HD74LS640 Datasheet

Octal Bus Transceivers

No Preview Available !

HD74LS640
Block Diagram
Enable G
Direction
Control DIR
B
Transceiver (1/8)
A
Absolute Maximum Ratings
Item
Symbol
Ratings
Supply voltage
VCC
7
Input voltage
VIN 7
Power dissipation
PT 400
Storage temperature
Tstg –65 to +150
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Unit
V
V
mW
°C
Recommended Operating Conditions
Item
Supply voltage
Output current
Operating temperature
Symbol
VCC
IOH
IOL
Topr
Min
4.75
–20
Typ
5.00
25
Max
5.25
–15
24
75
Unit
V
mA
mA
°C
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Symbol min. typ.* max. Unit
Condition
Input voltage
Hysteresis
VIH 2.0 — — V
VIL — — 0.8 V
VT+ – VT–
0.2
V VCC = 4.75 V
Output voltage
VOH
2.4 —
2—
V IOH = –3 mA VCC = 4.75 V,
V IOH = –15 mA VIH = 2 V, VIL = 0.8 V
VOL
— — 0.4 V IOL = 12 mA VCC = 4.75 V,
— — 0.5 V IOL = 24 mA VIH = 2 V, VIL = 0.8 V
Output current
IOZH
20
µA VO = 2.7 V
VCC = 5.25 V,
IOZL — — –400 µA VO = 0.4 V G input = 2 V
IIH — — 20 µA VCC = 5.25 V, VI = 2.7 V
Input
IIL — — –400 µA VCC = 5.25 V, VI = 0.4 V
current
A or B
DIR or G
II
0.1 mA VI = 5.5 V
0.1 mA VI = 7 V
VCC = 5.25 V
Short-circuit output current
IOS**
–40
–225
mA VCC = 5.25 V
ICCH — 48 70 mA
Supply current
ICCL — 62 90 mA VCC = 5.25 V, Output open
ICCZ — 64 95 mA
Input clamp voltage
VIK — — –1.5 V VCC = 4.75 V, IIN = –18 mA
Notes: * VCC = 5 V, Ta = 25°C
** Not more than one output shall be shorted at a time. the duration of the short circuit shall not exceed one
second.
Rev.2.00, Feb.18.2005, page 2 of 6


Part Number HD74LS640
Description Octal Bus Transceivers
Maker Renesas
Total Page 7 Pages
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