74HC_HCT4538_3 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 03 — 8 June 2009 7 of 24
NXP Semiconductors
74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
8. Recommended operating conditions
9. Static characteristics
Table 5. Recommended operating conditions
Voltages are referenced to GND (ground = 0 V)
Symbol Parameter Conditions 74HC4538 74HCT4538 Unit
Min Typ Max Min Typ Max
V
CC
supply voltage 2.0 5.0 6.0 4.5 5.0 5.5 V
V
I
input voltage 0 - V
CC
0-V
CC
V
V
O
output voltage 0 - V
CC
0-V
CC
V
T
amb
ambient temperature −40 - +125 −40 - +125 °C
∆t/∆V input transition rise and fall rate V
CC
= 2.0 V - - 625 - - - ns/V
V
CC
= 4.5 V - 1.67 139 - 1.67 139 ns/V
V
CC
= 6.0 V - - 83 - - - ns/V
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit
Min Typ Max Min Max Min Max
74HC4538
V
IH
HIGH-level
input voltage
V
CC
= 2.0 V 1.5 1.2 - 1.5 - 1.5 - V
V
CC
= 4.5 V 3.15 2.4 - 3.15 - 3.15 - V
V
CC
= 6.0 V 4.2 3.2 - 4.2 - 4.2 - V
V
IL
LOW-level
input voltage
V
CC
= 2.0 V - 0.8 0.5 - 0.5 - 0.5 V
V
CC
= 4.5 V - 2.1 1.35 - 1.35 - 1.35 V
V
CC
= 6.0 V - 2.8 1.8 - 1.8 - 1.8 V
V
OH
HIGH-level
output voltage
V
I
= V
IH
or V
IL
I
O
= −20 µA; V
CC
= 2.0 V 1.9 2.0 - 1.9 - 1.9 - V
I
O
= −20 µA; V
CC
= 4.5 V 4.4 4.5 - 4.4 - 4.4 - V
I
O
= −20 µA; V
CC
= 6.0 V 5.9 6.0 - 5.9 - 5.9 - V
I
O
= −4.0 mA; V
CC
= 4.5 V 3.98 4.32 - 3.84 - 3.7 - V
I
O
= −5.2 mA; V
CC
= 6.0 V 5.48 5.81 - 5.34 - 5.2 - V
V
OL
LOW-level
output voltage
V
I
= V
IH
or V
IL
I
O
= 20 µA; V
CC
= 2.0 V - 0 0.1 - 0.1 - 0.1 V
I
O
= 20 µA; V
CC
= 4.5 V - 0 0.1 - 0.1 - 0.1 V
I
O
= 20 µA; V
CC
= 6.0 V - 0 0.1 - 0.1 - 0.1 V
I
O
= 4.0 mA; V
CC
= 4.5 V - 0.15 0.26 - 0.33 - 0.4 V
I
O
= 5.2 mA; V
CC
= 6.0 V - 0.16 0.26 - 0.33 - 0.4 V
I
I
input leakage
current
V
I
= V
CC
or GND;
V
CC
= 6.0 V
--±0.1 - ±1-±1 µA
pin nREXT/CEXT;
V
I
= 2.0 V or GND; other
inputs at V
CC
or GND;
V
CC
= 6.0 V
[1]
--±0.5 - ±5-±10 µA
