Philips Semiconductors
3.3V BTL 7-bit Futurebus+ transceiver (standard A-port)
Product specification
FBL22041
FEATURES
• 7-bit BTL transceiver
• Separate I/O on TTL A-port
• Inverting
• Three separate pairs of driver enables in a 1 bit, 3 bit, 3 bit
arrangement
• Drives heavily loaded backplanes with equivalent load
impedances down to 10Ω.
• High drive 100mA BTL open collector drivers on B-port
• Allows incident wave switching in heavily loaded backplane buses
• Reduced BTL voltage swing produces less noise and reduces
power consumption
• Built-in precision band-gap reference provides accurate receiver
thresholds and improved noise immunity
• Compatible with IEEE Futurebus+ or proprietary BTL backplanes
• Controlled output ramp and multiple GND pins minimize ground
bounce
• Each BTL driver has a dedicated Bus GND for a signal return
• Glitch-free power up/power down operation
• Low ICC current
• Tight output skew
• Supports live insertion
• Pins for the optional JTAG boundary scan function are provided
• High density packaging in plastic Quad Flatpack
• 5V compatible I/O on A-port
• The A port includes a series resistor of 30Ω making external
terminating resistors unnecessary
DESCRIPTION
The FBL22041 is a 7-bit bidirectional BTL transceiver and is
intended to provide the electrical interface to a high performance
wired-OR bus. The FBL22041 is an inverting transceiver.
The B-port drivers are Low-capacitance open collectors with
controlled ramp and are designed to sink 100mA. Precision band
gap references on the B-port insure very good noise margins by
limiting the switching threshold to a narrow region centered at 1.55V.
The FBL22041 is designed with a 30Ω series resistance in both the
HIGH and LOW states of the output.
The FBL22041 is pin and function compatible with FB2041 but
operates at a 3.3V supply voltage, greatly reducing power
consumption.
QUICK REFERENCE DATA
SYMBOL
tPLH
tPHL
tPLH
tPHL
COB
IOL
ICC
PARAMETER
Propagation delay
AIn to Bn
Propagation delay
Bn to AOn
Output capacitance (B0 - B6 only)
Output current (B0 - B6 only)
Standby
Supply Current
AIn to Bn (outputs Low or High)
Bn to AOn (outputs Low)
Bn to AOn (outputs High)
TYPICAL
4.1
3.6
5.2
5.1
6
100
6.0
5.1
13.4
10.6
UNIT
ns
ns
pF
mA
mA
ORDERING INFORMATION
PACKAGE
52-pin Plastic Quad Flatpack
COMMERCIAL RANGE
VCC = 3.3V±10%; Tamb = 0 to +70°C
FBL22041BB
DWG
No.
SOT379-1
1998 Aug 12
2
853-2039 19863