| Number of channels (#) | 8 |
| Technology Family | ALS |
| Supply voltage (Min) (V) | 4.5 |
| Supply voltage (Max) (V) | 5.5 |
| Input type | Bipolar |
| Output type | TTL |
| Clock Frequency (Max) (MHz) | 75 |
| IOL (Max) (mA) | 24 |
| IOH (Max) (mA) | 2.6 |
| ICC (Max) (uA) | 85000 |
| Features | High speed (tpd 10-50ns) |
- 3-State I/O-Type Read-Back Inputs
- Bus-Structured Pinout
- T/C\ Determines True or Complementary Data at Q Outputs
- 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 latches are designed specifically for storing the contents of the input data bus and providing the capability of reading back the stored data onto the input data bus. The Q outputs are designed with bus-driving capability.
The edge-triggered flip-flops enter the data on the low-to-high transition of the clock (CLK) input when the enable (
) input is low. Data can be read back onto the data inputs by taking the read (
) input low, in addition to having low. When EN\ is high, both the read-back and write modes are disabled. Transitions on should only be made with CLK high to prevent false clocking.
The polarity of the Q outputs can be controlled by the polarity (T/C\) input. When T/C\ is high, Q is the same as is stored in the flip-flops. When T/C\ is low, the output data is inverted. The Q outputs can be placed in the high-impedance state by taking the output-enable (
) input high. does not affect the internal operation of the register. Old data can be retained or new data can be entered while the outputs are off.
A low level at the clear (
) input resets the internal registers low. The clear function is asynchronous and overrides all other register functions.
The -1 version of the SN74ALS996 is identical to the standard version, except that the recommended maximum IOL for the -1 version is increased to 48 mA. There is no -1 version of the SN54ALS996.
The SN54ALS996 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS996 is characterized for operation from 0°C to 70°C.