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Renesas
Renesas Electronics
Description : 1 of 8 Data Selector / Multiplexer (with strobe and three-state Outputs)

1 of 8 Data Selector / Multiplexer (with strobe and three-state Outputs)

This Data selector / multiplexer contains full on-chip binary decoding to select one-of-eight Data sources and features a strobe-controlled 3-State output.
The strobe must be at a low logic level to enable this device. The 3-State Outputs permit a number of Outputs to be connected to a common bus.
When the strobe input is high, both Outputs are in a high-impedance state in which both the upper and lower transistors of each totem-pole output are off, and the output neither drives nor loads the bus significantly. When the strobe is low, the Outputs are activated and operate as standard TTL totem-pole Outputs.
To minimize the possibility that two Outputs will attempt to take a common bus to opposite logic levels, the output control circuitry is designed so that the average output disable time is shorter than the average output enable time.

Description : 8-Input Data Selector/Multiplexer with 3-State Outputs

8-Input Data Selector/Multiplexer with 3-State Outputs
High-Performance Silicon-Gate CMOS

The IN74HC251 is identical in pinout to the LS/ALS251. The device inputs are compatible with standard CMOS Outputs; with pullup resistors, they are compatible with LS/ALSTTL Outputs.
The device selects one of the eight binary Data Inputs, as determined by the Address Inputs. The Output Enable pin must be at a low level for the selected Data to appear at the Outputs. If Output Enable is high, the Y and the Y Outputs are in the highimpedance state. This 3-State feature allows the IN74HC251 to be used in bus-oriented systems.

Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices

SLS
System Logic Semiconductor
Description : 8-Input Data Selector/Multiplexer with 3-State Outputs

8-Input Data Selector/Multiplexer with 3-State Outputs
High-Performance Silicon-Gate CMOS

The SL74HC251 is identical in pinout to the LS/ALS251. The device inputs are compatible with standard CMOS Outputs; with pullup resistors, they are compatible with LS/ALSTTL Outputs.
The device selects one of the eight binary Data Inputs, as determined by the Address Inputs. The Output Enable pin must be at a low level for the selected Data to appear at the Outputs. If Output Enable is high, the Y and the Y Outputs are in the high-impedance state. This 3-State feature allows the IN74HC251 to be used in bus-oriented systems.

 • Outputs Directly Interface to CMOS, NMOS, and TTL
 • Operating Voltage Range: 2.0 to 6.0 V
 • Low Input Current: 1.0 μA
 • High Noise Immunity Characteristic of CMOS Devices

Part Name(s) : HD74LS251
Hitachi
Hitachi -> Renesas Electronics
Description : 1 of 8 Data Selector / Multiplexer (with strobe and three-state Outputs)

1 of 8 Data Selector / Multiplexer (with strobe and three-state Outputs)

IKSEMICON
IK Semicon Co., Ltd
Description : Quad 2-Input Data Selector/Multiplexer with 3-State Outputs

Quad 2-Input Data Selector/Multiplexer with 3-State Outputs
High-Performance Silicon-Gate CMOS

The IN74HC257A is identical in pinout to the LS/ALS257. The device inputs are compatible with standard CMOS Outputs; with pullup resistors, they are compatible with LS/ALSTTL Outputs.
This device selects a (4-bit) nibble from either the A or B inputs as determined by the Select input. The nibble is presented at the Outputs in noninverted from when the Output Enable pin is at a low level. A high level on the Output Enable pin switches the Outputs into the high impedance state.

Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices

 

INTE-ElectronicGRAL
Integral Corp.
Description : 8-Input Data Selector/Multiplexer with 3-State Outputs High-Speed Silicon-Gate CMOS

8-Input Data Selector/Multiplexer with 3-State Outputs High-Speed Silicon-Gate CMOS

The IN74AC251 is identical in pinout to the LS/ALS251, HC/HCT251. The device inputs are compatible with standard CMOS Outputs; with pullup resistors, they are compatible with LS/ALS Outputs.
The device selects one of the eight binary Data Inputs, as determined by the Address Inputs. The Output Enable pin must be at a low level for the selected Data to appear at the Outputs. If Output Enable is high, the Y and the Y Outputs are in the high-impedance state. This 3-State feature allows the IN74AC251 to be used in bus oriented systems.

Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA; 0.1 µA @ 25°C
• High Noise Immunity Characteristic of CMOS Devices
Outputs Source/Sink 24 mA

System-Logic
System Logic Semiconductor
Description : 8-Input Data Selector/Multiplexer with 3-State Outputs High-Performance Silicon-Gate CMOS

8-Input Data Selector/Multiplexer with 3-State Outputs
High-Performance Silicon-Gate CMOS

The SL74HC251 is identical in pinout to the LS/ALS251. The device inputs are compatible with standard CMOS Outputs; with pullup resistors, they are compatible with LS/ALSTTL Outputs.
The device selects one of the eight binary Data Inputs, as determined by the Address Inputs. The Output Enable pin must be at a low level for the selected Data to appear at the Outputs. If Output Enable is high, the Y and the Y Outputs are in the high-impedance state. This 3-State feature allows the IN74HC251 to be used in bus-oriented systems.

 • Outputs Directly Interface to CMOS, NMOS, and TTL
 • Operating Voltage Range: 2.0 to 6.0 V
 • Low Input Current: 1.0 μA
 • High Noise Immunity Characteristic of CMOS Devices

INTE-ElectronicGRAL
Integral Corp.
Description : Quad 2-Input Data Selector/Multiplexer with 3-State Outputs

Quad 2-Input Data Selector/Multiplexer with 3-State Outputs
High-Performance Silicon-Gate CMOS

The IN74HC257 is identical in pinout to the LS/ALS257. The device inputs are compatible with standard CMOS Outputs; with pullup resistors, they are compatible with LS/ALSTTL Outputs.
This device selects a (4-bit) nibble from either the A or B inputs as determined by the Select input. The nibble is presented at the Outputs in noninverted from when the Output Enable pin is at a low level. A high level on the Output Enable pin switches the Outputs into the high impedance state.

Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices

 

INTE-ElectronicGRAL
Integral Corp.
Description : Quad 2-Input Data Selector/Multiplexer with 3-State Outputs

Quad 2-Input Data Selector/Multiplexer with 3-State Outputs
High-Speed Silicon-Gate CMOS

The IN74AC257 is identical in pinout to the LS/ALS257, HC/HCT257. The device inputs are compatible with standard CMOS Outputs; with pullup resistors, they are compatible with LS/ALS Outputs.
This device selects a (4-bit) nibble from either the A or B inputs as determined by the Select input. The nibble is presented at the Outputs in noninverted from when the Output Enable pin is at a low level. A high level on the Output Enable pin switches the Outputs into the high-impedance state.

Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA; 0.1 µA @ 25°C
• High Noise Immunity Characteristic of CMOS Devices
• Output Source/Sink 24 mA

System-Logic
System Logic Semiconductor
Description : Quad 2-Input Data Selector/Multiplexer

Quad 2-Input Data Selector/Multiplexer

This monolitic Data Selector/Multiplexer contains inverters and drivers to supply full on-chip Data selection to the four output gates. A separate strobe input is provided. A 4-bit word is selected from one of two sources and is routed to the four Outputs. The LS157 has the same functions and pin connections as the LS257 but the latter is provided with 3-State Outputs.

 • Buffered Inputs and Outputs
 • Common Strobe/Select input for all 4 circuits

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