參數資料
型號: SN75976ADL
廠商: Texas Instruments, Inc.
英文描述: 12-Bit 250kHz CMOS Analog-to-Digital Converter w/Serial Interface 2.5V Internal Reference 20-SOIC -40 to 85
中文描述: 9通道差分收發(fā)器
文件頁數: 3/28頁
文件大?。?/td> 459K
代理商: SN75976ADL
SN75976A, SN55976A
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SLLS218B – MAY 1995 – REVISED MAY 1997
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
Logic
Level
I/O
Termination
DESCRIPTION
NAME
1A to 9A
NO.
4,6,8,10,
19,21,23,
25,27
TTL
I/O
Pullup
1A to 9A carry data to and from the communication controller.
1B– to 9B–
29,31,33,
35,37,.46,
48,50,52
RS-485
I/O
Pulldown
1B– to 9B– are the inverted data signals of the balanced pair to/from
the bus.
1B+ to 9B+
30,32,34,
36,38,47,
49,51,53
RS-485
I/O
Pullup
1B+ to 9B+ are the noninverted data signals of the balanced pair to/from
the bus.
BSR
2
TTL
Input
Pullup
BSR is the bit significant response. BSR disables receivers 1 through 8 and
enables wired-OR drivers when BSR and DE/RE and CDE1 or CDE2 are
high. Channel 9 is placed in a high-impedance state with BSR high.
CDE0
54
TTL
Input
Pulldown
CDE0 is the common driver enable 0. Its input signal enables all drivers
when CDE0 and 1DE/RE – 9DE/RE are high.
CDE1
55
TTL
Input
Pulldown
CDE1 is the common driver enable 1. Its input signal enables drivers
1 to 4 when CDE1 is high and BSR is low.
CDE2
56
TTL
Input
Pulldown
CDE2 is the common driver enable 2. When CDE2 is high and BSR is low,
drivers 5 to 8 are enabled.
CRE
3
TTL
Input
Pullup
CRE is the common receiver enable. When high, CRE disables receiver
channels 5 to 9.
1DE/RE to
9DE/RE
5,7,9,11,
20,22,24,
26,28
TTL
Input
Pullup
1DE/RE–9DE/RE are direction controls that transmit data to the bus when
it and CDE0 are high. Data is received from the bus when
1DE/RE–9DE/RE and CRE and BSR are low and CDE1 and CDE2 are
low.
GND
1,13,14,
15,16,17,
40,41,42,
43,44
NA
Power
NA
GND is the circuit ground. All GND terminals except terminal 1 are
physically tied to the die pad for improved thermal conductivity.
VCC
12,18,39,
45
NA
Power
NA
Supply voltage
Terminal 1 must be connected to signal ground for proper operation.
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