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PDF BTF1A Data sheet ( Hoja de datos )
| Número de pieza | BTF1A | |
| Descripción | Dual Differential Transceiver BTF1A With Idle Bus Indicator | |
| Fabricantes | Agere Systems | |
| Logotipo |  |
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Dual Differential Transceiver BTF1A
With Idle Bus Indicator
Data Sheet
March 2001
Features
Driver Features
s Produces a logic zero in third state
s 400 mV difference voltage in third state
s Two line drivers per package
s Logic to convert TTL input logic levels to differen-
tial, pseudo-emmiter coupled logic (ECL) output
logic levels
s No line loading when VCC = 0 V
s High output driver for 50 Ω loads
s 200 mA short-circuit current (typical)
s 2.0 ns maximum propagation delay
s <0.2 ns output skew (typical)
Receiver Features
s Two line receivers per package
s High input impedance ≅ 8 kΩ
s Logic that converts differential input logic levels to
TTL output logic levels
s 4.0 ns maximum propagation delay
s <0.20 V input sensitivity (typical)
s −1.2 V to +7.2 V common-mode range
Common Device Features
s Common enable for each driver/receiver pair
s Operating temperature range: –40 °C to +125 °C
(wider than the 41 Series)
s Single 5.0 V ± 5% supply
s 400 Mbits/s maximum data rate
s Meets enhanced small device interface (ESDI)
standards
s Electrostatic discharge (ESD) performance better
than the 41 Series
s Lower power requirement than the 41 Series
Description
The BTF1A device is a dual differential transceiver
circuit that transmits and receives digital data over
balanced transmission lines and is compatible with
Lucent Technologies Microelectronics Group differ-
ential drivers and receivers. It is designed to provide
a strong logic zero when in the third state. The mini-
mum difference voltage in the third state is 400 mV. It
is designed specifically for bus applications where a
well-defined logic state is needed when the bus is
idle. The driver puts out a logic zero when in the third
state mode, which is easily overriden by an active
buffer on the bus. When all the buffers on the bus are
inactive (third state), the signal on the bus is a zero
indicating that the bus is idle.
The dual drivers translate input TTL logic levels to dif-
ferential pseudo-ECL output levels. The dual receiver
converts differential input logic levels to TTL output
levels. Each driver/receiver pair has its own common
enable control allowing serial data and a control clock
to be transmitted and received on a single integrated
circuit. The BTF1A transceiver requires the customer
to supply termination resistors on the circuit board.
The powerdown loading characteristics of the
receiver input circuit are approximately 8 kΩ relative
to the power supplies; hence, it will not load the
transmission line when the circuit is powered down.
For those circuits with termination resistors, the line
will remain impedance matched when the circuit is
powered down. The driver does not load the line
when it is powered down.
1 page  
Data Sheet
March 2001
Dual Differential Transceiver BTF1A
With Idle Bus Indicator
Electrical Characteristics (continued)
Table 5. Receiver Voltage and Current Characteristics
For variation in minimum VOH and maximum VOL over the temperature range, see Figure 10. TA = –40 °C to +125 °C.
Parameter
Symbol
Min
Typ
Max
Unit
Output Voltages VCC = 4.75 V:
Low, IOL = 8.0 mA1
VOL —
— 0.5
V
High, IOH = −400 µA
VOH 2.4
—
—
V
Enable Input Voltages:
Low, VCC = 5.25 V
High, VCC = 4.75 V
VIL1
—
— 0.7
V
VIH1
2.0
—
—
V
Clamp, VCC = 4.75 V, II = –5.0 mA
Minimum Differential Input Voltages, VIH – VIL:2
−0.80 V < VIH < 7.2 V, −1.2 V < VIL < 6.8 V
VIK
VTH1
—
—
— −1.0
0.1 0.20
V
V
Input Offset Voltage
VOFF
0.03 0.05
V
Output Currents, VCC = 5.25 V:
Off-state (high Z), VO = 0.4 V
IOZL
—
— –20 µA
Off-state (high Z), VO = 2.4 V
Short Circuit
IOZH
IOS3
—
–25
— 20 µA
—
–100
mA
Enable Input Currents, VCC = 5.25 V:
Low, VIN = 0.4 V
IIL — — –400 µA
High, VIN = 2.7 V
IIH — — 20 µA
Reverse, VIN = 5.5 V
IIH — — 100 µA
Differential Input Currents:
Low, VIN = –1.2 V
IIL — — −1.0 mA
High, VIN = 7.2 V
IIH — — 1.0 mA
1. The input levels and difference voltage provide zero noise immunity and should be tested only in a static, noise-free environment.
2. Outputs of unused receivers assume a logic 1 level when the inputs are left open. (It is recommended that all unused positive inputs
be tied to the positive power supply. No external series resistor is required.)
3. Test must be performed one lead at a time to prevent damage to the device.
Agere Systems Inc.
5
5 Page 
Data Sheet
March 2001
Dual Differential Transceiver BTF1A
With Idle Bus Indicator
Temperature Characteristics (continued)
3.8
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0.0
–50
–25
IOH MIN
IOL MAX
0 25 50 75 100
TEMPERATURE (°C)
125 150
12-3464.a(F)
Figure 12. Minimum VOH and Maximum VOL vs.
Temperature at VCC = 4.5 V for the
Receiver
4.00
3.50
3.00
2.50
2.00
MAX
TYP
MIN
1.50
1.00
–50 –25
0 25 50 75 100
TEMPERATURE (°C)
125 150
12-3465(F)
Figure 14. Propagation Delay for a High Output
(tPLH) vs. Temperature at VCC = 5.0 V for
the Receivers
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
0.3
–50
RANGE FOR tP1 AND tP2
MAX
MIN
–25 0 25 50 75 100
TEMPERATURE (°C)
125 150
12-3469.a(F)
Figure 13. Min and Max for tP1 and tP2 Propagation
Delays vs. Temperature for the Driver
4.00
3.50
MAX
3.00
2.50
2.00
TYP
MIN
1.50
1.00
–50 –25
0 25 50 75 100
TEMPERATURE (°C)
125 150
12-3466(F)
Figure 15. Propagation Delay for a Low Output
(tPHL) vs. Temperature at VCC = 5.0 V for
the Receivers
Agere Systems Inc.
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet BTF1A.PDF ] | |
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