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參數(shù)資料
| 型號： | HI-1574PSIF |
| 廠商： | HOLT INTEGRATED CIRCUITS INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | 3.3V Monolithic Dual Transceivers |
| 中文描述： | DATACOM, MIL-STD-1553 DATA BUS TRANSCEIVER, PDSO20 |
| 封裝： | ROHS COMPLIANT, PLASTIC, ESOIC-20 |
| 文件頁數(shù)： | 2/9頁 |
| 文件大?。?/td> | 176K |
| 代理商： | HI-1574PSIF |
PIN
SYMBOL
FUNCTION
DESCRIPTION
(DIP & SOIC)
1
VDDA
power supply
+3.3 volt power for transceiver A
2
BUSA
analog output
MIL-STD-1533 bus driver A, positive signal
3
analog output
MIL-STD-1553 bus driver A, negative signal
4
RXENA
digital input
Receiver A enable. If low, forces RXA and
low (HI-1573) or High (HI-1574)
5
GNDA
power supply
Ground for transceiver A
6
VDDB
7
BUSB
9
RXENB
10
GNDB
11
12
RXB
digital output
Receiver B output, non-inverted
13
TXINHB
digital input
Transmit inhibit, bus B. If high BUSB,
disabled
14
TXB
digital input
Transmitter B digital data input, non-inverted
15
digital input
Transmitter B digital data input, inverted
16
digital output
BUSA
RXA
BUSB
TXB
RXA
power supply
+3.3 volt power for transceiver B
analog output
MIL-STD-1533 bus driver B, positive signal
8
analog output
MIL-STD-1553 bus driver B, negative signal
digital input
Receiver B enable. If low, forces RXB and
low (HI-1573) or High (HI-1574)
power supply
Ground for transceiver B
digital output
Receiver B output, inverted
Receiver A output, inverted
17
RXA
digital output
Receiver A output, non-inverted
18
TXINHA
digital input
Transmit inhibit, bus A. If high BUSA,
disabled
19
TXA
digital input
Transmitter A digital data input, non-inverted
20
digital input
Transmitter A digital data input, inverted
BUSB
RXB
RXB
BUSA
TXA
PIN DESCRIPTIONS
FUNCTIONAL DESCRIPTION
The HI-1573 family of data bus transceivers contains dif-
ferential voltage source drivers and differential receivers.
They are intended for applications using a MIL-STD-1553
A/B data bus. The device produces a trapezoidal output
waveformduringtransmission.
Data input to the device’s transmitter section is from the
complementary CMOS inputs TXA/B and
transmitter accepts Manchester II bi-phase data and con-
verts it to differential voltages on
The transceiver outputs are either direct or transformer
coupled to the MIL-STD-1553 data bus.
methods produce a nominal voltage on the bus of 7.5 volts
peaktopeak.
The
.
Both coupling
TRANSMITTER
TX/ .
BUSA/B and
/
The transmitter is automatically inhibited and placed in the
high impedance state when both TXA/B and
ther at a logic “1” or logic “0” simultaneously.Alogic “1” ap-
plied to the TXINHA/B input will force the transmitter to the
highimpedancestate,regardlessofthestateofTXA/Band
/
TXA B.
TXA/ are ei-
BUSA B
RECEIVER
The receiver accepts bi-phase differential data from the
MIL-STD-1553 bus through the same direct or transformer
coupled interface as the transmitter. The receiver’s differ-
ential input stage drives a filter and threshold comparator
that produces CMOS data at the RXA/B and
pins.
RXA/ output
Each set of receiver outputs can be independently forced
to a logic "0" (HI-1573) or logic “1” (HI-1574) by setting
RXENAorRXENBlow.
Adirect coupled interface (see Figure 2) uses a 1:2.5 ratio
isolation transformer and two 55 ohm isolation resistors
betweenthetransformerandthebus.
In a transformer coupled interface (see Figure 3), the
transceiver is connected to a 1:1.79 isolation transformer
which in turn is connected to a 1:1.4 coupling transformer.
The transformer coupled method also requires two
coupling resistors equal to 75% of the bus characteristic
impedence (Zo) between the coupling transformer and the
bus.
MIL-STD-1553BUSINTERFACE
HI-1573, HI-1574
HOLT INTEGRATED CIRCUITS
2
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