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Part Name(s) : 74LS298
Fairchild
Fairchild Semiconductor
Description : Quad 2-Port Register Multiplexer with Storage

General Description
The DM74LS298 is a Quad 2-Port Register. It is the logical equivalent of a Quad 2-input multiplexer followed by a Quad 4-bit edge-triggered Register. A Common Select input selects between two 4-bit input ports (data sources). The selected data is transferred to the output Register synchronous with the HIGH-to-LOW transition of the Clock input.

Features
■ Select from two data sources
■ Fully edge-triggered operation
■ Typical power dissipation of 65 mW

Description : Quad 2-Port Register Multiplexer with Storage

General Description
The DM74LS298 is a Quad 2-Port Register. It is the logical equivalent of a Quad 2-input multiplexer followed by a Quad 4-bit edge-triggered Register. A Common Select input selects between two 4-bit input ports (data sources). The selected data is transferred to the output Register synchronous with the HIGH-to-LOW transition of the Clock input.

Features
■ Select from two data sources
■ Fully edge-triggered operation
■ Typical power dissipation of 65 mW

Description : Quad 2-Port Register

The SN54/74LS398 and SN54/74LS399 are Quad 2-Port Registers. They are the logical equivalent of a Quad 2-input multiplexer followed by a Quad 4-bit edge-triggered Register. A Common Select input selects between two 4-bit input ports (data sources). The selected data is transferred to the output Register on the LOW-to-HIGH transition of the Clock input. The SN54/74LS398 features both Q and Q inputs, while the SN54/74LS399 has only Q outputs.

• Select From Two Data Sources
• Fully Positive Edge-Triggered Operation
• Both True and Complemented Outputs on SN54/74LS398
• Input Clamp Diodes Limit High-Speed Termination Effects

Description : Quad Port T1/E1

[FILTRAN]



T1/CEPT(Quad Port T1/E1)



•  Eight transformers in a SMD package supporting four transmit and four receive channels

•  Units matched to leading dual and Quad T1/E1/CEPT/ISDN-PRI IC’s Quad Port T1/E1 8150-


Part Name(s) : 74AC399CW 74ACT399CW
Fairchild
Fairchild Semiconductor
Description : Quad 2-Port Register

General Description
The AC/ACT399 is the logical equivalent of a Quad 2-input multiplexer feeding into four edge-triggered flip-flops. A common Select input determines which of the two 4-bit words is accepted. The selected data enters the flip-flop on the rising edge of the clock.

Features
■ ICC reduced by 50%
■ Select inputs from two data sources
■ Fully positive edge-triggered operation
■ Outputs source/sink 24 mA
■ AC/ACT399 has TTL-compatible inputs

Description : Quad Parallel Register with Enable

Quad Parallel Register with Enable

Motorola
Motorola => Freescale
Description : Quad 2-Port Register

The MC54/74F398 is the logical equivalent of a Quad 2-input multiplexer feeding into four edge-triggered flip-flops. A common Select input determines which of the two 4-bit words is accepted. The selected data enters the flip-flops on the rising edge of the clock.

• Select Inputs from Two Data Sources
• Fully Positive Edge-Triggered Operation
• Both True and Complement Outputs

Part Name(s) : XF00137-32S
XFMRS
XFMRS Inc.
Description : T1/E1/CEPT Quad PORT

T1/E1/CEPT Quad PORT

Motorola
Motorola => Freescale
Description : Quad 2-Port Register

The MC54/74F399 is the logical equivalent of a Quad 2-input multiplexer feeding into four edge-triggered flip flops. A common Select input determines which of the two 4-bit words is accepted. The selected data enters the flip-flops on the rising edge of the clock. The MC54/74F399 is the 16-pin version of the MC54/74F398, with only the Q outputs of the flip-flops available.

• Select Inputs from Two Data Sources
• Fully Positive Edge-Triggered Operation

Part Name(s) : DM93L38N DM93L38
Fairchild
Fairchild Semiconductor
Description : 8-Bit Multiple Port Register

General Description
The DM93L38 is an 8-bit multiple port Register designed for high speed random access memory applications where the ability to simultaneously read and write is desirable. A common use would be as a Register bank in a three address computer. Data can be written into any one of the eight bits and read from any two of the eight bits simultaneously. The circuit uses TTL technology and is compatible with all TTL families.

Features
■ Master/slave operation permitting simultaneous write/read without race problems
■ Simultaneously read two bits and write one bit in any one of eight bit positions
■ Readily expandable to allow for larger word sizes

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