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STM7E1 Datasheet

  • STM7E1

  • 7 e 1 channels switch array

  • 618.68KB

  • 16頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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STM7E1
7 e 1 channels switch array
Features
鈻?/div>
鈻?/div>
鈻?/div>
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Main switches max. R
ON
less than 2
惟
Provides 7 auxiliary switches with R
ON
< 75
惟
6 V
PP
amplitude of analog input signal
Digital inputs are TTL levels compatible
Description
The STM7E1A consists of 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.
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).
TQFP64
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.
Table 1.
Device summary
Temperature range
-40 to 85 擄C
Package
TQFP64 (tape and reel)
Packaging
1000 parts per reel
Order code
STM7E1AR
November 2007
Rev 3
1/16
www.st.com
16

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