N74F194N

4-bit bidirectional universal shift register


The functional characteristics of the 74F194 4-Bit Bidirectional Shift Register are indicated in the Logic Diagram and Function Table. The register is fully synchronous, with all operations taking place in less than 9ns (typical) for 74F, making the device especially useful for implementing very high speed CPUs, or for memory buffer registers.

The 74F194 design has special logic features which increase the range of application. The synchronous operation of the device is determined by two Mode Select inputs, S0 and S1. As shown in the Mode Select-Function Table, data can be entered and shifted from left to right (shift right, Q0→Q1, etc.), or right to left (shift left, Q3→Q2, etc.), or parallel data can be entered, loading all 4 bits of the register simultaneously. When both S0 and S1 are Low, existing data is retained in a hold (do nothing) mode. The first and last stages provide D-type Serial Data inputs (DSR, DSL) to allow multistage shift right or shift left data transfers without interfering with parallel load operation. Mode Select and data inputs on the 74F194 are edge-triggered, responding only to the Low-to-High transition of the Clock (CP). Therefore, the only timing restriction is that the Mode Select and selected data inputs must be stable one setup time prior to the Low-to-High transition of the clock pulse. Signals on the Mode Select, Parallel Data (D0-D3) and Serial Data (DSR, DSL) can change when the clock is in either state, provided only the recommended setup and hold times, with respect to the clock rising edge, are observed. The four Parallel Data inputs (D0-D3) are D-type inputs. Data appearing on (D0-D3) inputs when S0 and S1 are High is transferred to the Q0-Q3 outputs respectively, following the next Low-to-High transition of the clock. When Low, the asynchronous Master Reset (MR) overrides all other input conditions and forces the Q outputs Low.

Features and benefits

  • Shift right and shift left capability
  • Synchronous parallel and serial data transfer
  • Easily expanded for both serial and parallel operation
  • Asynchronous Master Reset
  • Hold (do nothing) mode
All information on this product information page is subject to the subsequent disclaimers:

Devices listed on this page should not be used for new designs!

This product has been discontinued.
Click here for discontinuation information.

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Parametric search

Show functional diagram

Block diagram: N74F194D, N74F194N
Block diagram: N74F194D, N74F194N

Parametrics of this product

Type numberPackageNr of pinsPackage nameProduct statustpd(ns)VCC(V)FamilyNr of bitsPower dissipation considerationsLogic switching levelsOutput drive capability(mA)fmax(MHz)DescriptionTamb(Cel)
N74F194NSOT38-4
(DIP16)		16DIP16End of life5.54.5 - 5.5FAST4highTTL-1/+201504-bit bidirectional parallel or serial-in/parallel-out shift register0~70

Package

All type numbers in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
N74F194NN74F194N,6029336 728 90602Discontinued
Replacement product		SOT38-4
(DIP16) 		Tube (Signetics)74F194N

Outline drawing

Package VersionPackage NamePackage DescriptionReference CodesIssue Date
SOT38-4DIP16plastic dual in-line package; 16 leads (300 mil)2003-02-13

Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
N74F194N93367289060230-Jun-1331-Dec-13DN NXP-DN_201212003DNFull WithdrawalStandard End of Life. Multiple Source.

Quality, reliability & chemical content

All type numbers in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
N74F194NN74F194N,602N74F194NAlways Pb-free5.631.7761989342806396E8NANA
Quality and reliability disclaimer

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Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
N74F194N93367289060230-Jun-1331-Dec-13DN NXP-DN_201212003DNFull WithdrawalStandard End of Life. Multiple Source.

Documentation for this product

File nameTitleTypeFormatDate
74F1944-bit bidirectional universal shift registerData sheetpdf1989-04-04
AN2021Thermal considerations for FAST logic productsApplication notepdf1995-03-13
AN202Testing and specifying FAST logicApplication notepdf1987-06-01
AN203Test Fixtures for High Speed LogicApplication notepdf1998-04-02

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