74HC7540 Datasheet, PDF (6/7 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 74HCT
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
Note to HCT types
The value of additional quiescent supply current (∆I_CC) for a unit load of 1 is given in the family specifications.
To determine ∆I_CC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT UNIT LOAD
OE₁
1.30
OE₂
1.30
A_n
0.20
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
T_amb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HCT
+25
−40 to +85
−40 to +125
UNIT
V_CC
(V)
WAVEFORMS
min typ. max. min max. min. max.
t_PHL/ t_PLH propagation delay
A_n to Y_n
19 32
40
t_PZH/ t_PZL 3-state output enable time
19 32
40
OE_n to Y_n
t_PHZ/ t_PLZ 3-state output disable time
20 32
40
OE_n to Y_n
t_THL/ t_TLH output transition time
5 12
15
48 ns 4.5 Fig.8
48 ns 4.5 Fig.9
48 ns 4.5 Fig.9
18 ns 4.5 Fig.8
TRANSFER CHARACTERISTICS FOR 74HCT
Voltages are referred to GND (ground = 0 V)
T_amb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HCT
+25
−40 to +85
−40 to +125
UNIT
V_CC
(V)
WAVEFORMS
min typ. max. min max. min. max.
V_T+
positive-going threshold
2.0
2.0
2.1
2.1
2.0 V
2.1
4.5 Figs 6 and 7
5.5
V_T−
negative-going threshold 0.70
0.80
0.64
0.60
0.74
0.70
V 4.5 Figs 6 and 7
5.5
V_H
hysteresis (V_T+ − V_T−)
0.17 0.23
0.17 0.23
V 4.5 Figs 6 and 7
5.5
December 1990
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