mt8982as Mitel, mt8982as Datasheet - Page 2

• Manufacturer Part Number: mt8982as
• Description: Iso-cmos St-bus Family Small Digital Switch Minidx
• Manufacturer: Mitel

MT8982
Pin Description
2-32
1-2
3-4
16
10
11
12
13
14
15
16
5
6
7
8
9
Pin #
13,15
1-2
4-5
3,8,
20
10
11
12
14
16
17
18
19
20
6
7
9
SCLK/CSTi1
RxD/CSTi0
TxD/NC
SCLK/
CSTi0
CSTi1
Name
STo0-
STi0-
STo1
RxD/
STi1
MPS
ODE
TxD
F0o
STo0
STo1
C4i
V
V
F0i
NC
CS
STi0
STi1
VSS
IC
DD
16 PIN CERDIP/PLASTIC/SOIC
SS
ISO-CMOS
channels synchronized to F0i.
Serial TDM Output 0 and 1 (Outputs). 2048 kbit/s output data streams containing 32
8-bit channels synchronized to F0i.
Received Data/Control Stream Input 0 (Input). When MPS is low, this pin receives serial
microport data clocked in by the rising edge SCLK. When MPS is high, this pin receives a
2048 kbit/s serial TDM stream containing 32 8-bit channels, which are written into the
Connect Memory locations corresponding to STo0.
Transmit Data (Output). When MPS is low, serial microport data is clocked out on this pin
by the falling edge of SCLK. When MPS is high this output is disabled.
Serial Microport Clock/Control Stream Input 1 (Input). When MPS is low, this pin
receives a clock which is used to clock data to/from a microcontroller via a serial microport.
When MPS is high, this pin receives a 2048 kbit/s serial TDM stream containing 32 8-bit
channels, which are written into the Connect Memory locations corresponding to STo1.
Power Input. Negative supply (ground).
Chip Select (Input). When MPS is low, a low on this pin enables the serial microport. A
high on this pin disables RxD and tristates TxD. When MPS is high, this pin must be low.
Serial TDM Clock (Input). This clock input is used to clock the TDM data into and out of
the device and refreshes the internal dynamic RAM. The clock rate is 4.096 MHz and data
is clocked in on the rising edge of C4i three-quarters of the way through a bit period.
Frame Pulse (Input). This input is the frame synchronization pulse for the 2048 kbit/s
serial TDM streams. It may be either active low stradling the frame boundary (ST-BUS) or
active high at the beginning of timeslot 5 (GCI).
Frame Pulse (Output). This pin outputs a frame pulse in the opposite format to F0i (GCI
or ST-BUS) delayed or advanced by five channels.
Microport Select (Input). When this pin is held low, the serial microport is in normal mode.
When this pin is high, the microport is in serial bus mode.
Internal Connection. Tie to V
Output Drive Enable (Input). When this pin is held high, the STo0 and STo1 output drivers
function normally. When this pin is low, STo0 and STo1 are tristated.
NB: When ODE is high, individual channels on STo0 and STo1 can be tristated under
software control.
Power Input. Positive supply.
No Connection.
1
2
3
4
5
6
7
8
Serial TDM Input 0 and 1 (Inputs). 2048 kbit/s input data streams containing 32 8-bit
16
15
14
13
12
11
10
9
VDD
ODE
IC
MPS
F0o
F0i
C4i
CS
Figure 2 - Pin Connections
SS
for normal operation.
SCLK/CSTi1
RxD/CSTi0
TxD/NC
Description
STo0
STo1
STi0
STi1
VSS
NC
NC
10
1
2
3
4
5
6
7
8
9
20 PIN SSOP
20
19
18
17
16
15
14
13
12
11
VDD
ODE
IC
MPS
NC
F0i
NC
C4i
CS
F0o