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54191

SGS-THOMSON
Part Number 54191
Manufacturer SGS-THOMSON
Description 4 BIT SYNCHRONOUS UP/DOWN COUNTERS
Published Jul 18, 2016
Detailed Description M54/M74HC190 M54/M74HC191 4 BIT SYNCHRONOUS UP/DOWN COUNTERS . HIGH SPEED fMAX = 48 MHz (TYP.) AT VCC = 5 V . LOW POWE...
Datasheet PDF File 54191 PDF File

54191
54191

Overview
M54/M74HC190 M54/M74HC191 4 BIT SYNCHRONOUS UP/DOWN COUNTERS .
HIGH SPEED fMAX = 48 MHz (TYP.
) AT VCC = 5 V .
LOW POWER DISSIPATION ICC = 4 µA (MAX.
) AT TA = 25 °C .
HIGH NOISE IMMUNITY VNIH = VNIL = 28 % VCC (MIN.
) .
OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS .
SYMMETRICAL OUTPUT IMPEDANCE IOH = IOL = 4 mA (MIN.
) .
BALANCED PROPAGATION DELAYS tPLH = tPHL .
WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V TO 6 V .
PIN AND FUNCTION COMPATIBLE WITH 54/74LS190/191 B1R (Plastic Package) F1R (Ceramic Package) M 1R (Micro Package) C1R (Chip Carrier) ORDER CODES : M54HCXXXF1R M74HCXXXM1R M74HCXXXB1R M74HCXXXC1R PIN CONNECTIONS (top view) DESCRIPTION The M54/74HC190/191 are high speed CMOS 4-BIT SYNCHRONOUS UP/DOWN COUNTERS fabricated in silicon gate C2MOS technology.
They have the same high speed performance of LSTTL combined with true CMOS low power consumption.
State changes of the counter are synchronous with the LOW-to-HIGH transition of the Clock Pulse input.
An asynchronous parallel load input overrides counting and loads the data present on the DATA inputs into the flip-flops, which makes it possible to use the circuits as programmable counters.
A countenable input serves as the carry/borrow input in multi-stage counters.
Control input, Down/Up, determines whether a circuit counts up or down.
A MAX/MIN output and a Ripple Clock output provide overflow/underflow indication and make possible a variety of methods for generating carry/borrow signals in multistage counter applications.
All inputs are equipped with protection circuits against static discharge and transient excess voltage.
NC = No Internal Connection October 1992 1/14 M54/M74HC190/191 INPUT AND OUTPUT EQUIVALENT CIRCUIT IEC LOGIC SYMBOL (HC190) PIN DESCRIPTION PIN No 3, 2, 6, 7 4 5 11 12 13 14 15, 1, 10, 9 8 16 SYMBOL NAME AND FUNCTION QA to QD Flip-Flop Outputs ENABLE Count Enable Input (Active LOW) U/D Parallel Data Input LOAD Load Input (Active LOW) MA/MI OUT Terminal Count Output RC Ri...


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