MM74HC147

Features:

` Low quiescent power consumption: 40 mW maximum at 25
`High speed: 31 ns propagation delay (typical)
` Low input current: 1 A maximum
` Wide supply range: 2V to 6V


Specifications

Supply Voltage (V_CC)                           -0.5 to +7.0V
DC Input Voltage (V_IN)                         -1.5 to V_CC+1.5V
DC Output Voltage (V_OUT)                   -0.5 to V_CC+0.5V
Clamp Diode Current (I_IK, I_OK)            ±20 mA
DC Output Current, per pin (I_OUT)      ±25 mA
DC VCC or GND Current, per pin (I_CC) ±50 mA
Storage Temperature Range (T_STG)    -65 to +150
Power Dissipation (P_D)
(Note 3)                                              600 mW
S.O. Package only                               500 mW
Lead Temp. (T_L) (Soldering 10 seconds) 260


Description

This high speed 10-to-4 Line Priority Encoder MM74HC147 utilizes advanced silicon-gate CMOS technology. It possesses the high noise immunity and low power consumption of standard CMOS integrated circuits. This device is fully buffered, giving it a fanout of 10 LS-TTL loads.

The MM54HC147/MM74HC147 features priority encoding of the inputs to ensure that only the highest order data line is encoded. Nine input lines are encoded to a four line BCD output. The implied decimal zero condition requires no input condition as zero is encoded when all nine data lines are at a high logic level. All data inputs and outputs of MM74HC147 are active at the low logic level.

The MM74HC147 is functionally as well as pinout compatible with the standard 54LS/74LS logic family.

All inputs of MM74HC147 are protected from damage due to static discharge by internal diode clamps to V_CC and ground.