N74F138N

Number of Bits :
Number of Lines (Input / Output) :
Propagation Delay Time :
Supply Voltage - Max : 5.5 V
Supply Voltage - Min : 4.5 V
Product : Decoder / Demultiplexer
Packaging : Tube
Mounting Style : Through Hole
Package / Case : PDIP-16
Maximum Operating Temperature : + 70 C
Logic Family : F


Features:

• Demultiplexing capability
• Multiple input enable for easy expansion
• Ideal for memory chip select decoding
• Industrial temperature range available (40°C to +85°C)


Pinout




Specifications

Symbol	Parameter		Conditions	Units
VCC	Supply voltage		0.5 to +7.0	V
VIN	Input voltage		0.5 to +7.0D	V
IIN	Input current		30 to +5	mA
VOUT	Voltage applied to output in High output state		0.5 to VCC	V
IOUT	Current applied to output in Low output state		40	mA
Tamb	Operating free air temperature range	Commercial range	0 to +70	°C
		Industrial range	40 to +85	°C
TSTG	Storage temperature		65 to +150	°C

Description

The 74F138 decoder accepts three binary weighted inputs (A0, A1, A2) and when enabled, provides eight mutually exclusive, active low outputs (Q0 Q7). The device features three enable inputs; two active low (E0, E1) and one active high (E2). Every output will be high unless E0 and E1 are low and E2 is high. This multiple enable function of 74F138  allows easy parallel expansion of the device to 1-of-32 (5 lines to 32 lines) decoder with just four 74F138s and one inverter (see Figure 1). The device can be used as an eight output demultiplexer by using one of the active low enable inputs as the data input and the remaining enable inputs as strobes. Enable inputs not used must be permanently tied to their appropriate active high or active low state.