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74F138
Datasheet
General description
The 74F138 decoder accepts three binary weighted inputs (A0, A1, A2) and when enabled, provides eight mutually exclusive, active low outputs (Q0 ? Q7). The device features three enable inputs; two active low (E0, E1) and one active high (E2). Every output will be high unless E0 and E1 are low and E2 is high. This multiple enable function allows easy parallel expansion of the device to 1-of-32 (5 lines to 32 lines) decoder with just four 74F138s and one inverter . The device can be used as an eight output demultiplexer by using one of the active low enable inputs as the data input and the remaining enable inputs as strobes. Enable inputs not used must be permanently tied to their appropriate active high or active low state.
Features
- Demultiplexing capability
- Multiple input enable for easy expansion
- Ideal for memory chip select decoding
- Industrial temperature range available (?40°C to +85°C)
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| I74F138D | I74F138D | 9350 330 90602 | Volume production | SOT109-1
(SO16) | Tube (Signetics) | Standard Marking | I74F138D
| week 6, 2004 |
| I74F138D | I74F138D-T | 9350 330 90623 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" (Signetics) | Standard Marking | I74F138D
| week 6, 2004 |
| I74F138N | I74F138N | 9350 331 00602 | Volume production | SOT38-4
(DIP16) | Tube (Signetics) | Standard Marking | I74F138N
| Always Pb-free |
| N74F138D | N74F138D | 9337 394 50602 | Volume production | SOT109-1
(SO16) | Tube (Signetics) | Standard Marking | N74F138D
| week 6, 2004 |
| N74F138D | N74F138D-T | 9337 394 50623 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" (Signetics) | Standard Marking | N74F138D
| week 6, 2004 |
| N74F138N | N74F138N | 9336 729 00602 | Volume production | SOT38-4
(DIP16) | Tube (Signetics) | Standard Marking | N74F138N
| Always Pb-free |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| I74F138D | 9350 330 90602 | not available | ||||||
| I74F138D | 9350 330 90623 | Order samples | ||||||
| I74F138N | 9350 331 00602 | Order samples | ||||||
| N74F138D | 9337 394 50602 | 0.2800 | NA | ARROW ELECTRONICS | 2,619 | 8/27/2008 | Buy online | not available |
| NA | AVNET ELECTRONICS MARKETING | 5,577 | 8/29/2008 | Buy online | ||||
| NA | FUTURE ELECTRONICS | 1,564 | 8/28/2008 | Buy online | ||||
| N74F138D | 9337 394 50623 | 0.2800 | ASIA | WPI | 2,500 | 08/29/2008 | Buy online | Order samples |
| N74F138N | 9336 729 00602 | 0.3200 | Order samples |
Technical documents
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 |
|---|---|---|---|---|---|---|---|
| I74F138D | SOT109-1
(SO16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 6.1 | 4.5-5.5 V | 16 | TTL | -1/+20 mA |
| I74F138N | SOT38-4
(DIP16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 6.1 | 4.5-5.5 V | 16 | TTL | -1/+20 mA |
| N74F138D | SOT109-1
(SO16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 6.1 | 4.5-5.5 V | 16 | TTL | -1/+20 mA |
| N74F138N | SOT38-4
(DIP16) | 3-to-8 Line Decoder/Demultiplexer; Inverting | 6.1 | 4.5-5.5 V | 16 | TTL | -1/+20 mA |
Similar products
74F138 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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