Philips 74HC HCT191 Presettable Synchronous 4-Bit Binary Up/Down Counter Data Manual
Summary
This datasheet provides specifications for the 74HC and 74HCT191 presettable synchronous 4-bit binary up and down counter, a high-speed Si-gate CMOS logic device. It covers counting modes, parallel load operation, terminal count and ripple clock output functions, multistage counter cascading configurations, and timing characteristics for digital logic design applications.
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查询74HC/HCT191供应商
INTEGRATED CIRCUITS
DATA SHEET For a complete data sheet, please also download: The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications The IC06 74HC/HCT/HCU/HCMOS Logic Package Information The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT191 Presettable synchronous 4-bit binary up/down counter
Product specification December
File under Integrated Circuits, IC06
Page Summary Contents For Philips 74HC HCT191 Presettable Synchronous 4-Bit Binary Up/Down Counter Data Manual
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查询74HC/HCT191供应商 INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications The IC06 74HC/HCT/HCU/HCMOS Logic Package Infor...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter FEATURES Overflow/underflow indications are provided by two types of outputs, the terminal...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter QUICK REFERENCE DATA GND V; Tamb °C; tr tf ns TYPICAL SYMBOL PARAMETER CONDITIONS UNIT HC ...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter PIN DESCRIPTION PIN NO. SYMBOL NAME AND FUNCTION 3, 2, 6, 7 Q0 to Q3 flip-flop outputs CE ...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter Fig.4 Functional diagram. FUNCTION TABLE INPUTS OUTPUTS OPERATING MODE PL U/D CE CP Dn Qn ...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter Fig.5 N-stage ripple counter using ripple clock. Fig.6 Synchronous n-stage counter using r...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter Sequence Load (preset) to binary thirteen; count up to fourteen, fifteen, zero, one and tw...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter DC CHARACTERISTICS FOR 74HC For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Famil...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter Tamb (°C) TEST CONDITIONS 74HC SYMBOL PARAMETER UNIT WAVEFORMS +25 −40 to +85 −40 to +125 ...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter DC CHARACTERISTICS FOR 74HCT For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Fami...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter AC CHARACTERISTICS FOR 74HCT GND 0 V; tr tf 6 ns; CL 50 p F Tamb (°C) TEST CONDITIONS SYMB...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter AC WAVEFORMS (1) HC VM 50%; VI GND to VCC. HCT VM 1.3 V; VI GND to 3 V. Fig.10 Waveforms s...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter (1) HC VM 50%; VI GND to VCC. HCT VM 1.3 V; VI GND to 3 V. Fig.13 Waveforms showing the in...
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Philips Semiconductors Product specification Presettable synchronous 4-bit binary 74HC/HCT191 up/down counter The shaded areas indicate when the input is permitted to change for predictable output per...
Manual Details
| Brand | Philips |
|---|---|
| Pages | 14 |
| File Size | 99.06 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
How do I check for overflow or underflow events?
Overflow/underflow indications are provided by two specific outputs: the terminal count (TC) and the ripple clock (RC).
Is this counter compatible with older logic standards like TTL?
Yes, these high-speed Si-gate CMOS devices are pin compatible with low power Schottky TTL.
What is the maximum operating frequency of the 74HC/HCT191?
The maximum clock frequency (f) this device supports is 36 MHz.
Can I use the TC output signal as a standard clock input?
No, the TC signal is used internally and should not be used as a standard output clock because it is subject to decoding spikes.