SN54GTL16622A, SN74GTL16622A

18-BIT LVTTL-TO-GTL/GTL+ BUS TRANSCEIVERS

SCBS673D – AUGUST 1996 – REVISED DECEMBER 1999

2

POST OFFICE BOX 655303

description (continued)

Data flow in each direction is controlled by the output-enable (OEAB and OEBA) and clock (CLKAB and CLKBA)

inputs. The clock-enable (CEAB and CEBA) inputs are designed to control each 9-bit transceiver independently,

which makes the device more versatile.

For A-to-B data flow, the device operates on the low-to-high transition of CLKAB if CEAB is low. When OEAB

is low, the outputs are active. When OEAB is high, 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, CLKBA, and CEBA.

outputs, preventing damaging current backflow through the device when it is powered down.

Active bus-hold circuitry holds unused or undriven LVTTL inputs at a valid logic state. Use of pullup or pulldown

resistors with the bus-hold circuitry is not recommended.

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN54GTL16622A is characterized for operation over the full military temperature range of –55

°C to 125°C.

The SN74GTL16622A is characterized for operation from –40

°C to 85°C.

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

9876543

21 68 67 66 65 64 63 62 61

SN54GTL16622A . . . HV PACKAGE

(TOP VIEW)

NC – No internal connection

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

60

59

58

57

56

55

54

53

52

51

50

49

48

47

46

45

44

GND

1A5

1A6

GND

1A7

1A8

GND

1A9

NC

2A1

GND

2A2

2A3

GND

2A4

2A5

GND

1B4

1B5

1B6

GND

1B7

1B8

GND

1B9

NC

2B1

GND

2B2

2B3

GND

2B4

2B5

2B6