SN54ABT16501

Supply voltage range, V _CC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . .  0.5 V to 7 V
Input voltage range, V _I (except I/O ports) (see Note 1)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  0.5 V to 7 V
Voltage range applied to any output in the high or power-off state, V_O   . . . . . . . . . . . . . . . . . . ..... 0.5 V to 5.5 V
Current into any output in the low state, I_O : SN54ABT16501 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . 96 mA

                                                                        SN74ABT16501  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .....128 mA
Input clamp current, I_IK  (V_I  < 0)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18 mA
 
Output clamp current, I_OK  (V_O  < 0)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50 mA
Package thermal impedance, q JA (see Note 2): DGG package  . . . . . . . . . . . . . . . . . ......... . . . . . . . . . . . . . 81 /W
                                                                              DL package  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... . 74 W
Storage temperature range, T_stg    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  65 to 150

These SN54ABT16501 18-bit universal bus transceivers consist of storage elements that can operate either as D-type latches or D-type flip-flops to allow data flow in transparent or clocked modes.
Data flow in each direction of SN54ABT16501 is controlled by output-enable (OEAB and OEBA), latch-enable (LEAB and LEBA), and clock (CLKAB and CLKBA) inputs. For A-to-B data flow, the device operates in the transparent mode when LEAB is high. When LEAB is low, the A data is latched if CLKAB is held at a high or low logic level. If LEAB is low, the A data is stored in the latch/flip-flop on
the low-to-high transition of CLKAB. When OEAB is high, the outputs are active. When OEAB is low, the outputs are in the high-impedance state.

Data flow for B to A is similar to that of A to B but uses OEBA, LEBA, and CLKBA. The output of SN54ABT16501 enables are complementary (OEAB is active high and OEBAis active low). To ensure the high-impedance state during power up or power down, OE should be tied to GND through a pulldown resistor and OE should be tied to V _CC through a pullup resistor; the minimum value of the resistor is determined by the current-sourcing/current-sinking capability of the driver.