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74F257A
Datasheet
General description
The 74F257A has four identical 2-input multiplexers with 3-State outputs which select 4 bits of data from two sources uncer control of a common Select (S) input. The I0a inputs are selected when the common Select input is Low and the I1n inputs are selected when the common Select input is High. Data appears at the outputs in true non-inverted form from the selected inputs. The 74F257A is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the common Slect input. Outputs are forced to a high impedance ?off? state when the Output Enable (OE) is High. All but one device must be in high impedance state to avoid currents that would exceed the maximum rating if the outputs were tied together. Design of the Output Enable signals must ensure that there is no overlap when outputs of 3-state devices were tied together.
Features
- Industrial range available (?40°C to +85°C)
- Multifunction capability
- Non-inverting data path
- 3-State outputs
- See 74F258A for inverting version
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| I74F257AD | I74F257AD | 9351 970 90112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | I74F257AD
| week 6, 2004 |
| I74F257AD | I74F257AD-T | 9351 970 90118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | I74F257AD
| week 6, 2004 |
| I74F257AN | I74F257AN | 9351 971 00112 | Volume production | SOT38-4
(DIP16) | Tube | Standard Marking | I74F257AN
| Always Pb-free |
| N74F257AD | N74F257AD | 9338 126 10602 | Volume production | SOT109-1
(SO16) | Tube (Signetics) | Standard Marking | N74F257AD
| week 6, 2004 |
| N74F257AD | N74F257AD-T | 9338 126 10623 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" (Signetics) | Standard Marking | N74F257AD
| week 6, 2004 |
| N74F257AN | N74F257AN | 9338 126 00602 | Volume production | SOT38-4
(DIP16) | Tube (Signetics) | Standard Marking | N74F257AN
| Always Pb-free |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|
| I74F257AD | 9351 970 90112 | not available | |||||||
| I74F257AD | 9351 970 90118 | Order samples | |||||||
| I74F257AN | 9351 971 00112 | Order samples | |||||||
| N74F257AD | 9338 126 10602 | 0.3200 | NA | ARROW ELECTRONICS | 25 | 1/8/2009 | Buy online | not available | |
| N74F257AD | 9338 126 10623 | 0.3200 | NA | ARROW ELECTRONICS | 2,500 | 1/8/2009 | Buy online | Order samples | |
| NA | DIGI-KEY CORPORATION | 5,000 | 1/8/2009 | Buy online | |||||
| NA | DIGI-KEY CORPORATION | 5,000 | 1/8/2009 | Buy online | |||||
| NA | MOUSER ELECTRONICS | 350 | 1/8/2009 | Buy online | |||||
| N74F257AN | 9338 126 00602 | 0.3700 | Order samples |
Design support
Application Notes
AN202_1;
Testing and specifying FAST logic (01-Jun-87)AN203_2;
Test Fixtures for High Speed Logic (02-Apr-98)AN216_2;
Arbitration in shared resource systems (18-Jul-88)Parametrics/similar products
| Type number | Package | Description | Propagation Delay(ns) | Voltage | No. of Pins | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|
| I74F257AD | SOT109-1
(SO16) | Quad 2-Input Multiplexer (3-State) | 4.5 | 4.5-5.5 V | 16 | TTL | -3/+24 mA |
| I74F257AN | SOT38-4
(DIP16) | Quad 2-Input Multiplexer (3-State) | 4.5 | 4.5-5.5 V | 16 | TTL | -3/+24 mA |
| N74F257AD | SOT109-1
(SO16) | Quad 2-Input Multiplexer (3-State) | 4.5 | 4.5-5.5 V | 16 | TTL | -3/+24 mA |
| N74F257AN | SOT38-4
(DIP16) | Quad 2-Input Multiplexer (3-State) | 4.5 | 4.5-5.5 V | 16 | TTL | -3/+24 mA |
Similar products
74F257A
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