STM7E1A Datasheet, PDF (1/10 Pages) STMicroelectronics – 7 E 1 CHANNELS SWITCH ARRAY

STM7E1A
7 E 1 CHANNELS SWITCH ARRAY
s MAIN SWITCHES MAX. R_ON LESS THAN 2Ω
s PROVIDES 7 AUXILIARY SWITCHES WITH
R_ON < 75Ω
s 6V_PP AMPLITUDE OF ANALOG INPUT
SIGNAL
s DIGITAL INPUTS ARE TTL LEVELS
COMPATIBLE
DESCRIPTION
The STM7E1 consists in 7 identical ISDN E1
channels, each channel corresponding to 4 main
low-resistant switches (a and b) and 2 auxiliary
switches (c and d). The switches positions in all
the channels are identical and controlled by a
unique control resource driven by the digital inputs
Lm, Ls and Sc.
In each channel, the TX and RX lines can be
switched between a Main port or a Spare-port by
the main switches: if both "a" switches are closed
and both "b" switches are open, the Main port is
connected to the line, while if both "a" switches
are open and both "b' switches are closed, the
spare port is connected to the line.
The 2 auxiliary switches enable to close a local
loop between the TX and RX access of a port: if
"c" is closed, the Spare port RX and TX access is
connected between each other to form a local
loop, while if "d" is closed, the Main port RX and
TX access is connected between each other to
form a local loop.
TQFP64
The Spare port is only used for test purpose on the
system board while the Main port is the
communication channel. Consequently, a
switching from the Main port to the Spare port
occurs very rarely (<10 times a day).
The power supplies of the chip need to be de
coupled properly. This means that at least one
external capacitor C1 must be connected in
between GND and VPOS, one external capacitor
C2 between GND and VNEG, and one external
capacitor C3 between each pair of VNEG and
VPOS.
ORDERING CODES
Type
STM7E1A
STM7E1AR
Temperature
Range
-40 to 85 °C
-40 to 85 °C
Package
TQFP64 (Tray)
TQFP64 (Tape & Reel)
Comments
160 parts per Tray
1000 parts per reel
December 2002
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