74HC7540 Datasheet, PDF (5/7 Pages) NXP Semiconductors – Octal Schmitt trigger buffer/line driver; 3-state; inverting

Philips Semiconductors
Octal Schmitt trigger buffer/line driver;
3-state; inverting
Product specification
74HC/HCT7540
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Transfer characteristics are given below (not applicable for OE_n inputs).
Output capability: bus driver
I_CC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
T_amb (°C)
SYMBOL PARAMETER
74HC
UNIT
+25
−40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t_PHL/ t_PLH propagation delay
A_n to Y_n
t_PZH/ t_PZL
t_PHZ/ t_PLZ
t_THL/ t_TLH
3-state output enable
time
OE_n to Y_n
3-state output disable
time
OE_n to Y_n
output transition time
39 120
150
14 24
30
11 20
26
41 150
190
15 30
38
12 26
33
52 150
190
19 30
38
15 26
33
14 60
75
5 12
15
4 10
13
180 ns
36
31
225 ns
45
38
225 ns
45
38
90 ns
18
15
TEST CONDITIONS
V_CC
(V)
WAVEFORMS
2.0 Fig.8
4.5
6.0
2.0 Fig.9
4.5
6.0
2.0 Fig.9
4.5
6.0
2.0 Fig.8
4.5
6.0
TRANSFER CHARACTERISTICS FOR 74HC
Voltages are referred to GND (ground = 0 V)
T_amb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
+25
min. typ. max.
74HC
−40 to +85
min. max.
−40 to +125
min. max.
UNIT
V_CC
(V)
WAVEFORMS
V_T+
positive-going threshold
1.50
1.50
3.15
3.15
4.20
4.20
1.50 V
3.15
4.20
2.0 Figs 6 and 7
4.5
6.0
V_T−
negative-going threshold 0.30
1.35
1.80
0.30
0.30
1.35
1.35
1.80
1.80
V 2.0 Figs 6 and 7
4.5
6.0
V_H
hysteresis (V_T+ − V_T−) 0.10 0.20
0.25 0.40
0.30 0.50
0.10
0.25
0.30
0.10
0.25
0.30
V 2.0 Figs 6 and 7
4.5
6.0
December 1990
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