Features: .HIGH SPEED
fMAX = 54 MHz (TYP.) AT VCC = 5 V
.LOWPOWER DISSIPATION
ICC = 4 mA (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.)
.BALANCEDPROPAGATION DELAYS
tPLH = tPHL
.WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
.PIN AND FUNCTION COMPATIBLE WITH 54/74LS192-193Pinout
Specifications
| Symbol |
Parameter |
Value |
Unit |
| VCC |
Supply Voltage |
-0.5 to +7 |
V |
| VI |
DC Input Voltage |
-0.5 to VCC + 0.5 |
V |
| VO |
DC Output Voltage |
-0.5 to VCC + 0.5 |
V |
| IIK |
DC Input Diode Current |
± 20 |
mA |
| IOK |
DC Output Diode Current |
± 20 |
mA |
| IO |
DC Output Source Sink Current Per Output Pin |
± 25 |
mA |
| ICC or IGND |
DC VCC or Ground Current |
± 50 |
mA |
| PD |
Power Dissipation |
500 (*) |
mW |
| Tstg |
Storage Temperature |
-65 to +150 |
oC |
| TL |
Lead Temperature (10 sec) |
300 |
oC |
Description TheM54/74HC192/193 are ahigh speedCMOSSYNCHRONOUSUP/DOWN DECADE COUNTERS fabricated in silicon gate C
2MOStechnology. They have thesame high speedperformance ofLSTTL combined with true CMOS low power consumption.
The counter of M54/74HC192/193 has two separate clock inputs, an UP COUNT input and a DOWN COUNT input. All outputs of the flip-flop are simultaneously triggered on the low to high transition of either clockwhilethe other input isheld high. The direction of counting is determined by which input is clocked. This counter may be preset by entering the
desired data on the DATA A, DATA B, DATA C, and DATA D input.When the LOADinput is taken low the data is loaded independently of either clock input. This feature allows the counters to be used as divide-by-n counters by modifying the count length with the preset inputs.
In addition the counter of M54/74HC192/193 can also be cleared. This is accomplished by inputting a high on the CLEAR input.All 4 internal stages are set to low independently of either COUNT input. Both aBORROWandCARRY output areprovided toenable cascading of bothupand down counting functions. The BORROW output produces a negative going pulse when thecounter underflows and the CARRY outputs a pulse when the counter overflows. The counter can be cascaded by connecting the CARRY and BORROWoutputs of one device to the COUNT UP and COUNTDOWN inputs, respectively, of the next device. All inputs are equipped with protection circuits against static discharge and transient excess voltage.
M54/M74HC192 Data Sheet
