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| 型號(hào)： | 933272300115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 功率晶體管 |
| 英文描述： | 1 A, 80 V, PNP, Si, POWER TRANSISTOR, TO-243AA |
| 封裝： | PLASTIC, MPT3, SMD, SC-62, UPAK-3 |
| 文件頁(yè)數(shù)： | 2/6頁(yè) |
| 文件大?。?/td> | 46K |
| 代理商： | 933272300115 |
January 1995
2
Philips Semiconductors
Product specication
Dual precision monostable multivibrator
HEF4538B
MSI
DESCRIPTION
The HEF4538B is a dual retriggerable-resettable
monostable multivibrator. Each multivibrator has an active
LOW trigger/retrigger input (I0), an active HIGH
trigger/retrigger input (I1), an overriding active LOW direct
reset input (CD), an output (O) and its complement (O),
and two pins (CTC,(1) RCTC) for connecting the external
timing components Ct and Rt. Typical pulse width variation
over temperature range is
± 0,2%.
The HEF4538B may be triggered by either the positive or
the negative edges of the input pulse and will produce an
accurate output pulse with a pulse width range of 10
s to
infinity. The duration and accuracy of the output pulse are
determined by the external timing components Ct and Rt.
The output pulse width (T) is equal to Rt × Ct. The linear
design techniques in LOCMOS guarantee precise control
of the output pulse width.
A LOW level at CD terminates the output pulse
immediately. Schmitt-trigger action in the trigger inputs
makes the circuit highly tolerant to slower rise and fall
times.
Fig.1 Functional diagram.
PINNING
Note
1. Always connected to ground.
FAMILY DATA, IDD LIMITS category MSI
See Family specifications.
HEF4538BP(N):
16-lead DIL; plastic (SOT38-1)
HEF4538BD(F):
16-lead DIL; ceramic (cerdip) (SOT74)
HEF4538BT(D):
16-lead SO; plastic (SOT109-1)
( ): Package Designator North America
I0A, I0B
input (HIGH to LOW triggered)
I1A, I1B
input (LOW to HIGH triggered)
CDA, CDB
direct reset input (active LOW)
OA, OB
output
OA, OB
complementary output (active LOW)
CTC A, CTC B
external capacitor connections(1)
RCTC A, RCTC B
external capacitor/ resistor
connections
Fig.2 Pinning diagram.
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