FBL22041BB 查看數據表（PDF） - Philips Electronics

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FBL22041BB

3.3V BTL 7-bit Futurebus + transceiver (standard A-port)

Philips Electronics 

Philips Semiconductors

3.3V BTL 7-bit Futurebus+ transceiver (standard A-port)

Product specification

FBL22041

52 51 50 49 48 47 46 45 44 43 42 41 40

LOGIC GND 1

AI1 2

AI2 3

AO2 4

LOGIC GND 5

AO3 6

LOGIC GND 7

AI3 8

AI4 9

AO4 10

LOGIC GND 11

AO5 12

LOGIC GND 13

7-Bit Transceiver

52-lead PQFP

39 BUS GND

38 B1

37 BUS GND

36 B2

35 BUS GND

34 B3

33 BUS GND

32 B4

31 BUS GND

30 B5

29 BUS GND

28 B6

27 N/C

14 15 16 17 18 19 20 21 22 23 24 25 26

The B-port interfaces to “Backplane Transceiver Logic” (See the

IEEE 1194.1 BTL standard). BTL features low power consumption

by reducing voltage swing (1Vp-p, between 1V and 2V) and reduced

capacitive loading by placing an internal series diode on the drivers.

BTL also provides incident wave switching, a necessity for high

performance backplanes.

There are three separate pairs of driver enables in a 1 bit, 3 bit, 3 bit

arrangement. The TTL/BTL output drivers for bit 0 are enabled with

OEA1/OEB1, output drivers for bits 1–2–3 are enabled with

OEA2/OEB2 and output drivers for bits 4–5–6 are enabled with

OEA3/OEB3.

SG00084

The A-port operates at TTL levels with separate I/O. The 3-state

A-port drivers are enabled when OEAn goes High after an extra 6ns

delay which is built in to provide a break-before-make function.

When OEAn goes Low, A-port drivers become High impedance

without any extra delay. During power on/off cycles, the A-port

drivers are held in a High impedance state when VCC is below 1.3V.

The B-port has an output enable, OEB0, which affects all seven

drivers. When OEB0 is High and OEBn is Low the output driver will

be enabled. When OEB0 is Low or if OEBn is High, the B-port

drivers will be inactive and at the level of the backplane signal.

1998 Aug 12

3

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