The 74HCT147 is a high speed silicon-gate CMOS device and is pin-compatible with low power Schottky TTL (LSTTL).

The 74HCT147 9-input priority encoder accepts data from nine active LOW inputs (l1 to l9) and provides binary representation on the four active LOW inputs (Y0 to Y3). A priority is assigned to each input so that when two or more inputs are simultaneously active, the input with the highest priority is represented on the output, with input line l9 having the highest priority.

This device provides the 10-line to 4-line priority encoding function by use of the implied decimal “zero”. The “zero” is encoded when all nine data inputs are HIGH, forcing all four outputs HIGH.

Features

Buffered Inputs and Outputs
Typical Propagation Delay: 13ns at V_CC = 5V, C_L = 15pF, T_A = 25°C
Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . . 15 LSTTL Loads
Wide Operating Temperature Range . . . -55°C to 125°C
Balanced Propagation Delay and Transition Times
Signiﬁcant Power Reduction Compared to LSTTL Logic ICs
HC Types
- 2V to 6V Operation
- High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC at V_CC = 5V
HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, V_IL= 0.8V (Max), V_IH = 2V (Min)
- CMOS Input Compatibility, I_l≤ 1µA at V_OL, V_OH

1 ea.

Quantity	Unit Price	Ext. Price
1	$0.65	$0.65
10	$0.60	$5.95
100	$0.56	$56.00

74HC147E