SN74LS148

Application

Audio
Automotive
Broadband
Digital Control
Military
Optical Networking
Security
Telephony
Video & Imaging
Wireless

Pinout




Specifications

Supply voltage, V_CC (see Note 1)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 V
Input voltage, V_I: '147, '148  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..5.5 V
                           'LS147, 'LS148 . . . . . . . . . . . . . . . . . . . . . . . . . . . .    . . . . .7 V
Inter-emitter voltage: '148 only (see Note 2)  . . . . . . . . . . . . . . . . . . .  . . .5.5 V
Package thermal impedance _JA (see Note 3): D package  . . . . . . .  . . .73°C/W
                                                                         N package  . . . . . . . . . ..67°C/W
                                                                         NS package  . . . . . . .     64°C/W
Storage temperature range, T_stg  . . . . . . . . . . . . . . . . . . . . . . .−65°C to 150°C


Description

  These TTL encoders feature priority decoding of the inputs to ensure that only the highest-order data line is encoded. The SN74LS148 devices encode nine data lines to four-line (8-4-2-1) BCD. The implied decimal zero condition requires no input condition, as zero is encoded when all nine data lines are at a high logic level.

  The SN74LS148 devices encode eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input EI and enable output EO) has been provided to allow octal expansion without the need for external circuitry. For all types, data inputs and outputs are active at the low logic level. All inputs are buffered to represent one normalized Series 54/74 or 54/74LS load, respectively.