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 HEF4538B MSI Dual precision monostable multivibrator 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. 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%. 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. The HEF4538B may be triggered by either the positive or the negative edges of the input pulse and will produce an Fig.2 Pinning diagram. 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 PINNING 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 Note 1. Always connected to ground. Fig.1 Functional diagram. FAMILY DATA, IDD LIMITS category MSI See Family specifications. January 1995 2 This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in _white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ... Philips Semiconductors 3 Dual precision monostable multivibrator January 1995 Product specification HEF4538B MSI Fig.3 Logic diagram. Philips Semiconductors Product specification HEF4538B MSI Dual precision monostable multivibrator FUNCTION TABLE INPUTS I0 I1 CD L H H X OUTPUTS O O L H H X L 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 Connection of the external timing components Rt and Ct. DC CHARACTERISTICS VSS = 0 V Tamb (°C) VDD V − 40 SYMBOL TYP. Supply current MAX. 5 active state 10 (see note) 15 ID + 25 TYP. MAX. + 85 TYP. MAX. 55 µA 150 µA 220 µA Input leakage current 15 ± IIN 300 (pins 2 and 14) Note 1. Only one monostable is switching: current present during output pulse (output O is HIGH). January 1995 4 1000 nA Philips Semiconductors Product specification HEF4538B MSI Dual precision monostable multivibrator AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns VDD V SYMBOL MIN. TYP. TYPICAL EXTRAPOLATION FORMULA MAX. Propagation delays I0, I1 → O HIGH to LOW 5 10 tPHL 15 I0, I1 → O LOW to HIGH 5 10 tPLH 15 CD → O HIGH to LOW 5 10 tPHL 15 CD → O LOW to HIGH 5 10 tPLH 15 Recovery times 5 CD → I0, I1 10 tRCD 200 460 ns 173 ns + (0,55 ns/pF) CL 90 180 ns 79 ns + (0,23 ns/pF) CL 60 120 ns 52 ns + (0,16 ns/pF) CL 220 440 ns 193 ns + (0,55 ns/pF) CL 85 190 ns 74 ns + (0,23 ns/pF) CL 60 120 ns 52 ns + (0,16 ns/pF) CL 125 250 ns 98 ns + (0,55 ns/pF) CL 55 110 ns 44 ns + (0,23 ns/pF) CL 40 80 ns 32 ns + (0,16 ns/pF) CL 125 250 ns 98 ns + (0,55 ns/pF) CL 55 110 ns 44 ns + (0,23 ns/pF) CL 40 80 ns 32 ns + (0,16 ns/pF) CL 20 40 ns 10 20 ns 5 10 ns 15 Retrigger times O, O → I0, I1 Minimum I0 pulse width; LOW Minimum I1 pulse width; HIGH Minimum CD pulse width; LOW 5 10 0 0 ns 15 0 ns 5 90 45 ns 10 tRO ns tWI0L 30 15 ns 15 24 12 ns 5 50 25 ns 10 tWI1H 24 12 ns 15 20 10 ns 5 55 25 ns 10 tWCDL 25 12 ns 15 20 10 ns Output O or O 5 218 230 242 µs pulse width 10 213 224 235 µs 15 211 223 234 µs Output O or O 5 10,3 10,8 11,3 ms pulse width 10 10,2 10,7 11,2 ms 10,1 10,6 11,1 ms tWO tWO 15 Output O or O 5 pulse width 10 15 January 1995 tWO 1,01 1,09 1,11 s 0,99 1,04 1,09 s 0,99 1,04 1,09 s 5 Rt = 100 kΩ Ct = 0,002 µF Rt = 100 kΩ Ct = 0,1 µF Rt = 100 kΩ Ct = 10 µF Philips Semiconductors Product specification HEF4538B MSI 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 5 pulse width over 10 temperature (Tamb) 15 SYMBOL MIN. ∆tWO TYP. MAX. ± 0,2 % ± 0,2 % ± 0,2 % ± 1,5 % ±1 % ±1 % ±1 % Change in output O ∆tWO pulse width over VDD range 5 to 15 V Pulse width variation 5 between circuits 10 in same package 15 ∆tWO Rt = 100 kΩ Ct = 2 nF to 10 µF External timing resistor Rt 5 − (1) kΩ Ct 2000 − no limits pF External timing capacitor Input capacitance (pin 2 or 14) CIN 15 pF Note 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 6 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 7 Philips Semiconductors Product specification HEF4538B MSI Dual precision monostable multivibrator (a) Rt = 100 kΩ; Ct = 100 nF.. (b) Rt = 100 kΩ; 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 kΩ. January 1995 Fig.9 8 Total supply current as a function of the output duty factor; Rt = 100 kΩ; Ct = 100 nF; CL = 50 pF. One monostable multivibrator switching only. WWW.ALLDATASHEET.COM Copyright © Each Manufacturing Company. All Datasheets cannot be modified without permission. This datasheet has been download from : www.AllDataSheet.com 100% Free DataSheet Search Site. Free Download. No Register. Fast Search System. www.AllDataSheet.com