HD74LS640 Datasheet, PDF (2/7 Pages) Hitachi Semiconductor – Octal Bus Transceivers(inverted 3-state outputs)

HD74LS640
Block Diagram
Enable G
B
Direction
Control DIR
Transceiver (1/8)
A
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Supply voltage
V_CC
7
V
Input voltage
V_IN
7
V
Power dissipation
Storage temperature
P_T
Tstg
400
mW
–65 to +150
°C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item
Supply voltage
Output current
Operating temperature
Symbol
V_CC
I_OH
I_OL
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
V_IH
2.0
—
—
V
V_IL
—
—
0.8
V
V_T+ – V_T–
0.2
—
—
V
V_CC = 4.75 V
Output voltage
V_OH
2.4
—
2
—
—
—
V
I_OH = –3 mA V_CC = 4.75 V,
V
I_OH = –15 mA ^VIH ^{= 2 V, V}IL ^{= 0.8 V}
V_OL
—
—
0.4
V
I_OL = 12 mA
V_CC = 4.75 V,
—
—
0.5
V
I_OL = 24 mA
V_IH = 2 V, V_IL = 0.8 V
Output current
I_OZH
—
—
20
µA V_O = 2.7 V
V_CC = 5.25 V,
I_OZL
—
—
–400
µA V_O = 0.4 V
G input = 2 V
I_IH
—
—
20
µA V_CC = 5.25 V, V_I = 2.7 V
Input
I_IL
—
—
–400
µA V_CC = 5.25 V, V_I = 0.4 V
current
A or B
DIR or G
I_I
—
—
—
—
0.1
mA V_I = 5.5 V
0.1
mA V_I = 7 V
V_CC = 5.25 V
Short-circuit output current
I_OS**
–40
—
–225
mA V_CC = 5.25 V
I_CCH
—
48
70
mA
Supply current
I_CCL
—
62
90
mA VCC = 5.25 V, Output open
I_CCZ
—
64
95
mA
Input clamp voltage
V_IK
—
—
–1.5
V
V_CC = 4.75 V, I_IN = –18 mA
Notes: * V_CC = 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