Philips 74HCT193U, 74HCT193DB, 74HCT193D, 74HC193U, 74HC193PW Datasheet

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/HCT193

Presettable synchronous 4-bit binary up/down counter

Product specification			December 1990
File under Integrated Circuits, IC06

Philips Semiconductors	Product specification

Presettable synchronous 4-bit binary

74HC/HCT193

up/down counter

FEATURES

∙Synchronous reversible 4-bit binary counting

∙Asynchronous parallel load

∙Asynchronous reset

∙Expandable without external logic

∙Output capability: standard

∙ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT193 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74HC/HCT193 are 4-bit synchronous binary up/down counters. Separate up/down clocks, CPU and

CPD respectively, simplify operation. The outputs change state synchronously with the LOW-to-HIGH transition of either clock input. If the CPU clock is pulsed while CPD is held HIGH, the device will count up. If the CPD clock is pulsed while CPU is held HIGH, the device will count down. Only one clock input can be held HIGH at any time, or erroneous operation will result. The device can be cleared at any time by the asynchronous master reset input (MR); it may also be loaded in parallel by activating the asynchronous parallel load input (PL).

The “193” contains four master-slave JK flip-flops with the necessary steering logic to provide the asynchronous reset, load, and synchronous count up and count down functions.

Each flip-flop contains JK feedback from slave to master, such that a LOW-to-HIGH transition on the CPD input will decrease the count by one, while a similar transition on the CPU input will advance the count by one.

One clock should be held HIGH while counting with the other, otherwise the circuit will either count by two’s or not at all, depending on the state of the first flip-flop, which cannot toggle as long as either clock input is LOW. Applications requiring reversible operation must make the reversing decision while the activating clock is HIGH to avoid erroneous counts.

The terminal count up (TCU) and terminal count down

(TCD) outputs are normally HIGH. When the circuit has reached the maximum count state of 15, the next HIGH-to-LOW transition of CPU will cause TCU to go LOW.

TCU will stay LOW until CPU goes HIGH again, duplicating the count up clock.

Likewise, the TCD output will go LOW when the circuit is in the zero state and the CPD goes LOW. The terminal count outputs can be used as the clock input signals to the next higher order circuit in a multistage counter, since they duplicate the clock waveforms. Multistage counters will not be fully synchronous, since there is a slight delay time difference added for each stage that is added.

The counter may be preset by the asynchronous parallel load capability of the circuit. Information present on the parallel data inputs (D0 to D3) is loaded into the counter and appears on the outputs (Q0 to Q3) regardless of the conditions of the clock inputs when the parallel load

(PL) input is LOW. A HIGH level on the master reset (MR) input will disable the parallel load gates, override both clock inputs and set all outputs (Q0 to Q3) LOW. If one of the clock inputs is LOW during and after a reset or load operation, the next LOW-to-HIGH transition of that clock will be interpreted as a legitimate signal and will be counted.

December 1990

2

Philips Semiconductors	Product specification

Presettable synchronous 4-bit binary

74HC/HCT193

up/down counter

QUICK REFERENCE DATA

GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns

	SYMBOL	PARAMETER	CONDITIONS	TYPICAL		UNIT
				HC	HCT
	tPHL/ tPLH	propagation delay CPD, CPU to Qn	CL = 15 pF; VCC = 5 V	20	20	ns
	fmax	maximum clock frequency		45	47	MHz
	CI	input capacitance		3.5	3.5	pF
	CPD	power dissipation capacitance per package	notes 1 and 2	24	26	pF

Notes

1. CPD is used to determine the dynamic power dissipation (PD in mW): PD = CPD ´ VCC2 ´ fi + å (CL ´ VCC2 ´ fo) where:

fi = input frequency in MHz

fo = output frequency in MHz

å (CL ´ VCC2 ´ fo) = sum of outputs

CL = output load capacitance in pF

VCC = supply voltage in V

2.For HC the condition is VI = GND to VCC

For HCT the condition is VI = GND to VCC - 1.5 V

ORDERING INFORMATION

See “74HC/HCT/HCU/HCMOS Logic Package Information”.

December 1990

3

Philips Semiconductors	Product specification

Presettable synchronous 4-bit binary

74HC/HCT193

up/down counter

PIN DESCRIPTION

PIN NO.		SYMBOL			NAME AND FUNCTION
3, 2, 6, 7		Q0 to Q3			flip-flop outputs
4		CPD			count down clock input(1)
5		CPU			count up clock input(1)
8		GND			ground (0 V)
11					asynchronous parallel load input (active LOW)
		PL
12					terminal count up (carry) output (active LOW)
		TC		U
13					terminal count down (borrow) output (active LOW)
		TC		D
14		MR			asynchronous master reset input (active HIGH)
15, 1, 10, 9		D0 to D3			data inputs
16		VCC			positive supply voltage

Note

1. LOW-to-HIGH, edge triggered

Fig.1 Pin configuration.		Fig.2 Logic symbol.

Fig.3 IEC logic symbol.

December 1990

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