| Number of channels (#) | 8 |
| Technology Family | AS |
| Supply voltage (Min) (V) | 4.5 |
| Supply voltage (Max) (V) | 5.5 |
| Input type | Bipolar |
| Output type | 3-State |
| Clock Frequency (Max) (MHz) | 125 |
| IOL (Max) (mA) | 48 |
| IOH (Max) (mA) | -24 |
| ICC (Max) (uA) | 90000 |
| Features | High speed (tpd 10-50ns) |
- Functionally Equivalent to AMD's AM29825
- Improved IOH Specifications
- Multiple Output Enables Allow Multiuser Control of the Interface
- Outputs Have Undershoot-Protection Circuitry
- Power-Up High-Impedance State
- Buffered Control Inputs Reduce dcLoading Effects
- Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (NT) and Ceramic (JT) 300-mil DIPs
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These 8-bit flip-flops feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. These devices are particularly suitable for implementing multiuser registers, I/O ports, bidirectional bus drivers, and working registers.
With the clock-enable (
) input low, the eight D-type edge-triggered flip-flops enter data on the low-to-high transitions of the clock (CLK) input. Taking high disables the clock buffer, latching the outputs. These devices have noninverting data (D) inputs. Taking the clear (
) input low causes the eight Q outputs to go low independently of the clock.
Multiuser buffered output-enable (
,
, and 
) inputs can be used to place the eight outputs in either a normal logic state (high or low logic level) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without interface or pullup components.
The output enables do not affect the internal operation of the flip-flops. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.
The SN54AS825A is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74AS825A is characterized for operation from 0°C to 70°C.
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= H if any of OE1\, OE2\, or OE3\ are high.
= L if all of OE1\, OE2\, or OE3\ are low.