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INTEGRATED CIRCUITS

DATA SHEET
For a complete data sheet, please also download:
· The IC04 LOCMOS HE4000B Logic Family Specifications HEF, HEC · The IC04 LOCMOS HE4000B Logic Package Outlines/Information HEF, HEC

HEF4538B MSI Dual precision monostable multivibrator
Product specification File under Integrated Circuits, IC04 January 1995

Philips Semiconductors

Product specification

Dual precision monostable multivibrator
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

HEF4538B MSI

accurate output pulse with a pulse width range of 10 µs 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.2 Pinning diagram.

HEF4538BP(N): HEF4538BD(F): HEF4538BT(D):

16-lead DIL; plastic (SOT38-1) 16-lead DIL; ceramic (cerdip) (SOT74) 16-lead SO; plastic (SOT109-1)

( ): Package Designator North America PINNING I0A, I0B I1A, I1B CDA, CDB OA, OB OA, OB CTC A, CTC B RCTC A, RCTC B Note 1. Always connected to ground. Fig.1 Functional diagram. FAMILY DATA, IDD LIMITS category MSI See Family specifications. January 1995 2 input (HIGH to LOW triggered) input (LOW to HIGH triggered) direct reset input (active LOW) output complementary output (active LOW) external capacitor connections(1) external capacitor/ resistor connections

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Dual precision monostable multivibrator HEF4538B MSI

Product specification

Philips Semiconductors

Product specification

Dual precision monostable multivibrator
FUNCTION TABLE INPUTS I0 H X Notes 1. H = HIGH state (the more positive voltage) L = LOW state (the less positive voltage) X = state is immaterial = positive output pulse = negative output pulse = positive-going transition = negative-going transition Fig.4 X I1 L CD H H L L H OUTPUTS O O

HEF4538B MSI

Connection of the external timing components Rt and Ct.

DC CHARACTERISTICS VSS = 0 V Tamb (°C) VDD V Supply current active state (see note) Input leakage current (pins 2 and 14) Note 1. Only one monostable is switching: current present during output pulse (output O is HIGH). 15 ± IIN 300 1000 nA 5 10 15 ID SYMBOL TYP. - 40 MAX. + 25 TYP. 55 150 220 MAX. TYP. + 85 MAX. µA µA µA

January 1995

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Philips Semiconductors

Product specification

Dual precision monostable multivibrator
AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times 20 ns VDD V Propagation delays I0, I1 O HIGH to LOW I0, I1 O LOW to HIGH CD O HIGH to LOW CD O LOW to HIGH Recovery times CD I0, I1 Retrigger times O, O I0, I1 Minimum I0 pulse width; LOW Minimum I1 pulse width; HIGH Minimum CD pulse width; LOW Output O or O pulse width Output O or O pulse width Output O or O pulse width 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 tWO tWO tWO tWCDL tWI1H tWI0L tRO 0 0 0 90 30 24 50 24 20 55 25 20 218 213 211 10,3 10,2 10,1 1,01 0,99 0,99 45 15 12 25 12 10 25 12 10 230 224 223 10,8 10,7 10,6 1,09 1,04 1,04 242 235 234 11,3 11,2 11,1 tRCD tPLH tPHL tPLH tPHL 200 90 60 220 85 60 125 55 40 125 55 40 20 10 5 460 ns 180 ns 120 ns 440 ns 190 ns 120 ns 250 ns 110 ns 80 ns 250 ns 110 ns 80 ns 40 ns 20 ns 10 ns ns ns ns ns ns ns ns ns ns ns ns ns µs µs µs ms ms ms Rt = 100 k Ct = 0,1 µF Rt = 100 k Ct = 10 µF SYMBOL MIN. TYP. MAX.

HEF4538B MSI

TYPICAL EXTRAPOLATION FORMULA 173 ns + (0,55 ns/pF) CL 79 ns + (0,23 ns/pF) CL 52 ns + (0,16 ns/pF) CL 193 ns + (0,55 ns/pF) CL 74 ns + (0,23 ns/pF) CL 52 ns + (0,16 ns/pF) CL 98 ns + (0,55 ns/pF) CL 44 ns + (0,23 ns/pF) CL 32 ns + (0,16 ns/pF) CL 98 ns + (0,55 ns/pF) CL 44 ns + (0,23 ns/pF) CL 32 ns + (0,16 ns/pF) CL

Rt = 100 k Ct = 0,002 µF

1,11 s 1,09 s 1,09 s

January 1995

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Philips Semiconductors

Product specification

Dual precision monostable multivibrator
AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times 20 ns VDD V Change in output O pulse width over temperature (Tamb) Change in output O pulse width over VDD range 5 to 15 V Pulse width variation between circuits in same package External timing resistor External timing capacitor Input capacitance (pin 2 or 14) Note CIN 15 pF Ct 2000 - no limits pF Rt 5 -
(1)

HEF4538B MSI

SYMBOL

MIN.

TYP. ± 0,2

MAX. % % % % % % % k Rt = 100 k Ct = 2 nF to 10 µF

5 10 15 tWO 5 10 15 tWO tWO

± 0,2 ± 0,2 ± 1,5 ±1 ±1 ±1

1. The maximum permissible resistance Rt , which holds the specified accuracy of tWO, depends on the leakage current of the capacitor Ct and the leakage of the HEF4538B.

January 1995

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Philips Semiconductors

Product specification

Dual precision monostable multivibrator

HEF4538B MSI

Fig.5 Waveforms showing minimum I0, I1, O and CD pulse widths, recovery times and propagation delays.

(1) Positive edge triggering. (2) Positive edge re-triggering (pulse lengthening). (3) Negative edge triggering. (4) Reset (pulse shortening). (5) T = Rt × Ct.

Fig.6 Timing diagram.

January 1995

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Philips Semiconductors

Product specification

Dual precision monostable multivibrator

HEF4538B MSI

(a) Rt = 100 k; Ct = 100 nF..

(b) Rt = 100 k; Ct = 2 nF.

Fig.7

Typical normalized change in output pulse width as a function of ambient temperature; 0% at VDD = 10 V and Tamb = 25 °C.

Fig.8

Typical normalized change in output pulse width as a function of the supply voltage at Tamb = 25 °C; 0% at VDD = 10 V; Rt = 100 k.

Fig.9

Total supply current as a function of the output duty factor; Rt = 100 k; Ct = 100 nF; CL = 50 pF. One monostable multivibrator switching only.

January 1995

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