DatasheetsPDF.com

54HC191 Dataheets PDF



Part Number 54HC191
Manufacturers National Semiconductor
Logo National Semiconductor
Description Synchronous Binary Up/Down Counters
Datasheet 54HC191 Datasheet54HC191 Datasheet (PDF)

MM54HC190 MM74HC190 MM54HC191 MM74HC191 January 1988 MM54HC190 MM74HC190 Synchronous Decade Up Down Counters with Mode Control MM54HC191 MM74HC191 Synchronous Binary Up Down Counters with Mode Control General Description These high speed synchronous counters utilize advanced silicon-gate CMOS technology They possess the high noise immunity and low power consumption of CMOS technology along with the speeds of low power Schottky TTL These circuits are synchronous reversible up down counter.

  54HC191   54HC191



Document
MM54HC190 MM74HC190 MM54HC191 MM74HC191 January 1988 MM54HC190 MM74HC190 Synchronous Decade Up Down Counters with Mode Control MM54HC191 MM74HC191 Synchronous Binary Up Down Counters with Mode Control General Description These high speed synchronous counters utilize advanced silicon-gate CMOS technology They possess the high noise immunity and low power consumption of CMOS technology along with the speeds of low power Schottky TTL These circuits are synchronous reversible up down counters The MM54HC191 MM74HC191 are 4-bit binary counters and the MM54HC190 MM74HC190 are BCD counters Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change simultaneously when so instructed by the steering logic This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple clock) counters The outputs of the four master-slave flip-flops are triggered on a low-to-high level transition of the clock input if the enable input is low A high at the enable input inhibits counting The direction of the count is determined by the level of the down up input When low the counter counts up and when high it counts down These counters are fully programmable that is the outputs may be preset to either level by placing a low on the load input and entering the desired data at the data inputs The output will change independent of the level of the clock input This feature allows the counters to be used as modulo- N dividers by simply modifying the count length with the preset inputs Two outputs have been made available to perform the cascading function ripple clock and maximum minimum count The latter output produces a high-level output pulse with a duration approximately equal to one complete cycle of the clock when the counter overflows or underflows The ripple clock output produces a low-level output pulse equal in width to the low-level portion of the clock input when an overflow or underflow condition exists The counters can be easily cascaded by feeding the ripple clock output to the enable input of the succeeding counter if parallel clocking is used or to the clock input if parallel enabling is used The maximum minimum count output can be used to accomplish look-ahead for high-speed operation Features Y Level changes on Enable or Down Up can be made regardless of the level of the clock input Y Wide power supply range 2 – 6V Y Low quiescent supply current 80 mA maximum (74HC Series) Y Low input current 1 mA maximum Connection Diagram Dual-In-Line Package Load H H L H Enable G L L X H Down Up L H X X Clock Function u Count Up u Count Down X Load X No Change Asynchronous inputs Low input to load sets QA e A QB e B QC e C and QD e D Order Number MM54HC190 191 or MM74HC190 191 Top View C1995 National Semiconductor Corporation TL F 5322 TL F 5322 – 1 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Notes 1 2) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage (VCC) DC Input Voltage (VIN) DC Output Voltage (VOUT) Clamp Diode Current (IIK IOK) DC Output Current per pin (IOUT) DC VCC or GND Current per pin (ICC) Storage Temperature Range (TSTG) Power Dissipation (PD) (Note 3) S O Package only b0 5 to a7 0V b1 5 to VCCa1 5V b0 5 to VCCa0 5V g20 mA g25 mA g50 mA b65 C to a150 C 600 mW 500 mW Lead Temp (TL) (Soldering 10 seconds) 260 C Operating Conditions Supply Voltage (VCC) DC Input or Output Voltage (VIN VOUT) Operating Temp Range (TA) MM74HC MM54HC Min 2 0 b40 b55 Input Rise or Fall Times (tr tf) VCCe2 0V VCCe4 5V VCCe6 0V Max 6 VCC a85 a125 1000 500 400 Units V V C C ns ns ns DC Electrical Characteristics (Note 4) Symbol Parameter Conditions VCC TAe25 C Typ 74HC 54HC TAeb40 to 85 C TAeb55 to 125 C Guaranteed Limits Units VIH Minimum High Level Input Voltage V V V V V V VIL Maximum Low Level Input Voltage V V V V V V VOH Minimum High Level VINeVIH or VIL Output Voltage lIOUTls mA V V V V V V VINeVIH or VIL lIOUTls mA lIOUTls mA VOL Maximum Low Level VINeVIH or VIL Output Voltage lIOUTls mA V V V V V V V V V V VINeVIH or VIL lIOUTls mA lIOUTls mA V V IIN Maximum Input VINeVCC or GND V Current g g V V g mA ICC Maximum Quiescent VINeVCC or GND V Supply Current IOUTe mA mA Note 1 Absolute Maximum Ratings are those values beyond which damage to the device may occur Note 2 Unless otherwise specified all voltages are referenced to ground Note 3 Power Dissipation temperature derating plastic ‘‘N’’ package b12 mW C from 65 C to 85 C ceramic ‘‘J’’ package b12 mW C from 100 C to 125 C Note 4 For a power supply of 5V g10% the worst case output voltages (VOH and VOL) occur for HC at 4 5V Thus the 4 5V values should be used when designing with this supply Worst case VIH and VIL occur at VCCe5 5V and 4 5V respectively (The VIH value at 5 5V is 3 85V ) The worst c.


MM74HC191 54HC191 74HC191


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)