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 HEF4938B Dual precision monostable multivibrator Preliminary specification File under Integrated Circuits, IC04 January 1995 Philips Semiconductors Preliminary specification Dual precision monostable multivibrator FEATURES HEF4938B ORDERING AND PACKAGE INFORMATION • Separate reset inputs PACKAGES TYPE NUMBER • Triggering from leading or trailing edge PINS PIN POSITION MATERIAL CODE 16 DIL plastic SOT38Z HEF4938B • ICC category: MSI PIN DESCRIPTION DESCRIPTION The HEF4938B 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 and RCTC) for connecting the external timing components Ct and Rt. Typical pulse width variation over temperature range is ±0.2%. The HEF4938B 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 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 inputs makes the circuit highly tolerant for slower rise and fall times. PIN NO. CTC A, CTC B external capacitor connections 2, 14 RCTC A, RCTC B external capacitor/resistor connections 3, 13 CDA, CDB direct reset input (active LOW) 4, 12 I1A, I1B input (LOW-to-HIGH triggered) 5, 11 I0A, I0B input (HIGH-to-LOW triggered) 6, 10 OA, OB output 7, 9 OA, OB complementary output (active LOW) 8 VSS ground (0 V) 16 VDD positive supply voltage Fig.1 Pin configuration. OUTPUTS I0 I1 CD ↑ L H H ↑ H X X L O O L H 3. X = state is immaterial 4. ↑ = positive-going transition Notes 5. ↓ = negative-going transition 1. H = HIGH voltage level 6. = positive output pulse 2. L = LOW voltage level 7. = negative output pulse January 1995 NAME AND FUNCTION 1, 15 FUNCTION TABLE INPUTS SYMBOL 2 Fig.2 Functional diagram. 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 Preliminary specification HEF4938B Fig.3 Logic diagram. Philips Semiconductors Preliminary specification Dual precision monostable multivibrator HEF4938B FUNCTION TABLE INPUTS I0 OUTPUTS I1 CD L H H O O L H H X X L Notes 1. H = HIGH state (the more positive voltage) 2. L = LOW state (the less positive voltage) 3. X = state is immaterial 4. = positive-going transition 5. = negative-going transition 6. = positive output pulse 7. = negative output pulse 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 5 active state 10 (see note) 15 ID MAX. + 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 Preliminary specification Dual precision monostable multivibrator HEF4938B AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns. PARAMETER VDD (V) SYMBOL MIN. TYP. MAX. − 200 460 UNIT TYPICAL EXTRAPOLATION FORMULA 173 ns + (0.55 ns/pF) CL Propagation delay 5 I0, I1 to O 10 − 90 180 HIGH to LOW 15 − 60 120 52 ns + (0.16 ns/pF) CL Propagation delay 5 − 220 440 193 ns + (0.55 ns/pF) CL I0, I1 to O 10 − 85 190 LOW to HIGH 15 − 60 120 52 ns + (0.16 ns/pF) CL Propagation delay 5 − 125 250 98 ns + (0.55 ns/pF) CL tPHL tPLH ns ns 79 ns + (0.23 ns/pF) CL 74 ns + (0.23 ns/pF) CL CD to O 10 − 55 110 HIGH to LOW 15 − 40 80 32 ns + (0.16 ns/pF) CL Propagation delay 5 − 125 250 98 ns + (0.55 ns/pF) CL tPHL CD to O 10 − 55 110 LOW to HIGH 15 − 40 80 5 − 20 40 tPLH Recovery times CD to I0, I1 10 − 10 20 15 − 5 10 Retrigger times 5 0 − − O, O to I0, I1 10 0 − − LOW to OFF 15 0 − − Minimum output 5 90 45 − pulse width LOW 10 30 15 − I0 15 24 12 − Minimum output 5 50 25 − pulse width LOW 10 24 12 − I1 15 20 10 − 5 9.3 10.0 10.6 9.2 9.9 10.5 9.1 9.8 10.4 Output pulse width O, O 10 15 January 1995 tRCD tRO tWIOL tWI1H tWO 5 ns ns 44 ns + (0.23 ns/pF) CL 44 ns + (0.23 ns/pF) CL 32 ns + (0.16 ns/pF) CL ns ns ns ns ms Rt = 100 kΩ; Ct = 100 nF Philips Semiconductors Preliminary specification Dual precision monostable multivibrator HEF4938B AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns VDD V Change in output O SYMBOL MIN. 5 pulse width over 10 temperature (Tamb) 15 ∆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 Preliminary specification Dual precision monostable multivibrator HEF4938B Fig.5 Waveforms showing minimum I0, I1, O and CD pulse widths, recovery times and propagation delays. January 1995 7 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 8 Dual precision monostable multivibrator January 1995 (1) (2) (3) (4) (5) Positive edge triggering. Positive edge re-triggering (pulse lengthening). Negative edge triggering. Reset (pulse shortening). T = Rt × Ct. HEF4938B Preliminary specification Fig.6 Timing diagram. 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. 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