HD74LS642 Datasheet, PDF (3/7 Pages) Hitachi Semiconductor – Octal Bus Transceivers(inverted open-collector outputs)

HD74LS642
Electrical Characteristics
Item
Input voltage
Hysteresis
Symbol
V_IH
V_IL
V_T+ – V_T–
min.
2.0
—
0.2
Output current
I_OH
—
Output voltage
—
V_OL
—
I_IH
—
Input
current
A or B
DIR or G
I_IL
—
—
I_I
—
Supply current**
I_CCH
—
I_CCL
—
I_CCZ
—
Input clamp voltage
V_IK
—
Notes: * V_CC = 5 V, Ta = 25°C
** I_CC is measured with all outputs open.
typ.*
—
—
—
—
—
—
—
—
—
—
48
62
64
—
max.
—
0.8
—
100
0.4
0.5
20
–400
0.1
0.1
70
90
95
–1.5
Unit
V
V
V
µA
V
µA
µA
mA
mA
mA
mA
mA
V
(Ta = –20 to +75 °C)
Condition
V_CC = 4.75 V
V_CC = 4.75 V, V_IH = 2 V, V_IL = 0.8 V,
V_OH = 5.5 V
I_OL = 12 mA V_CC = 4.75 V,
I_OL = 24 mA ^VIH ^{= 2 V, V}IL ^{= 0.8 V}
V_CC = 5.25 V, V_I = 2.7 V
V_CC = 5.25 V, V_I = 0.4 V
V_I = 5.5 V
V_I = 7 V
V_CC = 5.25 V
V_CC = 5.25 V
V_CC = 4.75 V, I_IN = –18 mA
Switching Characteristics
Item
Propagation delay time
Output enable time
(V_CC = 5 V, Ta = 25°C)
Symbol Inputs Outputs min. typ. max. Unit Condition
A
t_PLH
B
B
—
19
25
ns
A
—
19
25
ns
A
t_PHL
B
G
t_PLH
G
B
—
14
25
ns
A
—
14
25
ns C_L = 45 pF,
A
—
26
40
ns
R_L = 667 Ω
B
—
28
40
ns
G
t_PHL
G
A
—
43
60
ns
B
—
39
60
ns
Rev.2.00, Feb.18.2005, page 3 of 6