HD74LS645 Datasheet, PDF (3/7 Pages) Hitachi Semiconductor – Octal Bus Transceivers(non-inverted 3-state outputs)

HD74LS645
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_T+ – V_T–
0.2
—
—
V
V_CC = 4.75 V
Output voltage
V_OH
2.4
—
2
—
—
—
V
I_OH = –3 mA
I_OH = –15 mA
V_CC = 4.75 V,
V_IH = 2 V, V_IL = 0.8 V
V_OL
—
—
0.4
V
I_OL = 12 mA
V_CC = 4.75 V,
—
—
0.5
I_OL = 24 mA
V_IH = 2 V, V_IL = 0.8 V
Output current
I_OZH
I_OZL
—
—
—
—
20
–400
µA
V_O = 2.7 V
V_O = 0.4 V
V_CC = 5.25 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 ^{VI = 5.5 V}
0.1
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
Supply current**
I_CCL
—
62
90
mA V_CC = 5.25 V, Output open
I_CCZ
—
64
95
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
** I_CC is measured with all outputs open.
*** Not more than one output shall be shorted at a time. the duration of the short circuit shall not exceed one
second.
Switching Characteristics
Item
Propagation delay time
Output enable time
Output disable time
(V_CC = 5 V, Ta = 25°C)
Symbol Inputs Outputs min. typ. max. Unit Condition
A
t_PLH
B
B
—
8
15
ns
A
—
8
15
ns
A
t_PHL
B
G
t_ZL
G
B
—
11
15
ns
A
—
11
15
ns C_L = 45 pF,
A
—
31
40
ns
R_L = 667 Ω
B
—
31
40
ns
G
A
—
26
40
ns
t_ZH
G
B
—
26
40
ns
G
A
—
15
25
ns
t_LZ
G
B
—
15
25
ns
C_L = 5 pF,
G
A
—
15
25
ns
R_L = 667 Ω
t_HZ
G
B
—
15
25
ns
Rev.2.00, Feb.18.2005, page 3 of 6