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74HC/HCT194
General description
The 74HC/HCT194 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.
The functional characteristics of the 74HC/HCT194 4-bit bidirectional universal shift registers are indicated in the logic diagram and function table. The registers are fully synchronous.
The '194' design has special features which increase the range of application. The synchronous operation of the device is determined by the mode select inputs (S0, S1).
As shown in the mode select table, data can be entered and shifted from left to right (Q0® Q1® Q2 , etc.) or, right to left (Q3® Q2® Q1 , 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 are edge-triggered, responding only to the LOW-to-HIGH transition of the clock (CP). Therefore, the only timing restriction is that the mode control and selected data inputs must be stable one set-up time prior to the positive transition of the clock pulse.
The four parallel data inputs (D0 to D3) are D-type inputs. Data appearing on the D0 to D3 inputs, when S0 and S1 are HIGH, is transferred to the Q0 to 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.
The '194' is similar in operation to the '195' universal shift register, with added features of shift-left without external connections and hold ('do nothing') modes of operation.
Features
- Shift-left and shift-right capability
- Synchronous parallel and serial data transfer
- Easily expanded for both serial and parallel operation
- Asynchronous master reset
- Hold ('do nothing') mode
- Output capability: standard
- ICC category: MSI
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| 74HC194D | 74HC194D | 9337 140 90652 | Volume production | SOT109-1
(SO16) | Bulk Pack, CECC | Standard Marking | 74HC194D
| week 6, 2004 |
| 74HC194D | 74HC194D-T | 9337 140 90653 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13", CECC | Standard Marking | 74HC194D
| week 6, 2004 |
| 74HC194DB | 74HC194DB | 9351 897 40112 | Volume production | SOT338-1
(SSOP16) | Tube | Standard Marking | 74HC194DB
| week 12, 2005 |
| 74HC194DB | 74HC194DB-T | 9351 897 40118 | Volume production | SOT338-1
(SSOP16) | Reel Pack, SMD, 13" | Standard Marking | 74HC194DB
| week 12, 2005 |
| 74HC194N | 74HC194N | 9336 694 90652 | Volume production | SOT38-4
(DIP16) | Bulk Pack, CECC | Standard Marking | 74HC194N
| Always Pb-free |
| 74HCT194D | 74HCT194D | 9337 141 00652 | Volume production | SOT109-1
(SO16) | Bulk Pack, CECC | Standard Marking | 74HCT194D
| week 6, 2004 |
| 74HCT194D | 74HCT194D-T | 9337 141 00653 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13", CECC | Standard Marking | 74HCT194D
| week 6, 2004 |
| 74HCT194N | 74HCT194N | 9336 701 20652 | Volume production | SOT38-4
(DIP16) | Bulk Pack, CECC | Standard Marking | 74HCT194N
| Always Pb-free |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| 74HC194D | 9337 140 90652 | 0.2900 | NA | ARROW ELECTRONICS | 1,636 | 8/5/2008 | Buy online | Order samples |
| 74HC194D | 9337 140 90653 | 0.2900 | Order samples | |||||
| 74HC194DB | 9351 897 40112 | 0.2900 | NA | DIGI-KEY CORPORATION | 1,404 | 8/5/2008 | Buy online | not available |
| 74HC194DB | 9351 897 40118 | 0.2900 | Order samples | |||||
| 74HC194N | 9336 694 90652 | 0.3400 | NA | ARROW ELECTRONICS | 1,992 | 8/5/2008 | Buy online | Order samples |
| NA | AVNET ELECTRONICS MARKETING | 3,041 | 8/5/2008 | Buy online | ||||
| 74HCT194D | 9337 141 00652 | 0.2900 | NA | ARROW ELECTRONICS | 2,000 | 8/5/2008 | Buy online | not available |
| NA | DIGI-KEY CORPORATION | 230 | 8/5/2008 | Buy online | ||||
| 74HCT194D | 9337 141 00653 | 0.2900 | Order samples | |||||
| 74HCT194N | 9336 701 20652 | 0.3400 | Order samples |
Parametrics/similar products
| Type number | Package | Description | Fmax(MHz) | Propagation Delay(ns) | Voltage | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|
| 74HC194D | SOT109-1
(SO16) | 4-Bit Bidirectional Universal Shift Register | 102 | 14@5V | 2.0-6.0 V | Low Power or Battery Applications | CMOS | +/- 5.2 mA |
| 74HC194DB | SOT338-1
(SSOP16) | 4-Bit Bidirectional Universal Shift Register | 102 | 14@5V | 2.0-6.0 V | Low Power or Battery Applications | CMOS | +/- 5.2 mA |
| 74HC194N | SOT38-4
(DIP16) | 4-Bit Bidirectional Universal Shift Register | 102 | 14@5V | 2.0-6.0 V | Low Power or Battery Applications | CMOS | +/- 5.2 mA |
| 74HCT194D | SOT109-1
(SO16) | 4-Bit Bidirectional Universal Shift Register; TTL Enabled | 77 | 15 | 4.5-5.5V | Low Power | TTL | +/- 4 mA |
| 74HCT194N | SOT38-4
(DIP16) | 4-Bit Bidirectional Universal Shift Register; TTL Enabled | 77 | 15 | 4.5-5.5V | Low Power | TTL | +/- 4 mA |
Similar products
74HC/HCT194 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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