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74HCT4538N,112

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
74HC_HCT4538_3 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 03 — 8 June 2009 4 of 24
NXP Semiconductors
74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
5. Pinning information
5.1 Pinning
5.2 Pin description
Fig 3. Pin configuration for DIP16 and SO16 Fig 4. Pin configuration for SSOP16 and TSSOP16
74HC4538
74HCT4538
1CEXT V
CC
1REXT/CEXT 2CEXT
1CD 2REXT/CEXT
1B 2CD
1A 2B
1Q 2A
1Q 2Q
GND 2Q
001aak190
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
74HC4538
74HCT4538
1CEXT V
CC
1REXT/CEXT 2CEXT
1CD 2REXT/CEXT
1B 2CD
1A 2B
1Q 2A
1Q 2Q
GND 2Q
001aak191
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
Table 2. Pin description
Symbol Pin Description
1CEXT, 2CEXT 1, 15 external capacitor connection (always connected to ground)
1REXT/CEXT, 2REXT/CEXT 2, 14 external capacitor/resistor connection
1
CD, 2CD 3, 13 direct reset input (active LOW)
1B, 2B 4, 12 input (LOW to HIGH triggered)
1
A, 2A 5, 11 input (HIGH to LOW triggered)
1Q, 2Q 6, 10 output
1
Q, 2Q 7, 9 complementary output (active LOW)
GND 8 ground (0 V)
V
CC
16 supply voltage
74HC_HCT4538_3 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 03 — 8 June 2009 5 of 24
NXP Semiconductors
74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
6. Functional description
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care;
↑ = positive-going transition; ↓ = negative-going transition;
= one HIGH level output pulse, with the pule width determined by C
EXT
and R
EXT
;
= one LOW level output pulse, with the pulse width determined by C
EXT
and R
EXT
.
Table 3. Function table
Inputs Outputs
nA nB nCD nQ nQ
↓ LH
H ↑ H
XXLLH
(1) Positive edge triggering.
(2) Positive edge re-triggering (pulse lengthening).
(3) Negative edge triggering.
(4) Reset (pulse shortening).
(5) T = 0.7 × R
EXT
× C
EXT
(see also Figure 6).
Fig 5. Timing diagram
001aae737
(1)
(3)
(5)
(4)
(1)(2)(1)
V
ref1
T
V
ref2
V
ref2
V
ref1
TT
nA input
nB input
nCD input
nREXT/CEXT input
nQ output
74HC_HCT4538_3 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 03 — 8 June 2009 6 of 24
NXP Semiconductors
74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
7. Limiting values
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] P
tot
derates linearly with 12 mW/K above 70 °C.
[3] P
tot
derates linearly with 8 mW/K above 70 °C.
[4] P
tot
derates linearly with 5.5 mW/K above 60 °C.
Fig 6. Connection of the external timing components R
EXT
and C
EXT
001aak192
nQ
nCD
nQ
nREXT/CEXT
nB
nCEXT
GND
V
CC
R
EXT
C
EXT
nA
T = 0.7 × R
EXT
× C
EXT
T
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Max Unit
V
CC
supply voltage −0.5 +7.0 V
I
IK
input clamping current V
I
< −0.5 V or V
I
>V
CC
+ 0.5 V
[1]
- ±20 mA
I
OK
output clamping current V
O
< −0.5 V or V
O
> V
CC
+ 0.5 V
[1]
- ±20 mA
I
O
output current V
O
= −0.5 V to V
CC
+ 0.5 V - ±25 mA
I
CC
supply current - +50 mA
I
GND
ground current −50 - mA
T
stg
storage temperature −65 +150 °C
P
tot
total power dissipation T
amb
= −40 °C to +125 °C
DIP16 package
[2]
- 750 mW
SO16 package
[3]
- 500 mW
(T)SSOP16 package
[4]
- 500 mW
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

74HCT4538N,112

Mfr. #:
Buy 74HCT4538N,112
Manufacturer:
NXP Semiconductors
Description:
Monostable Multivibrator DUAL RETRIG PRECSION
Lifecycle:
New from this manufacturer.
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