MT90870 Zarlink Semiconductor, Inc., MT90870 Datasheet - Page 73

• Manufacturer Part Number: MT90870
• Description: Flexible 12k Digital Switch (F12kDX)
• Manufacturer: Zarlink Semiconductor, Inc.

Preliminary Information
Backplane and Local Output High-Impedance Timing
Note 1:
High Impedance is measured by pulling to the appropriate rail with R
LSTo0 - 15
2.048Mb/s
LSTo0 - 15
* CK_int is the internal clock signal of 131.072MHz
LSTi0 - 15
LSTo0 - 15
4.096Mb/s
4.096Mb/s
8.192Mb/s
8.192Mb/s
1
2
LSTi0 - 15
2.048Mb/s
LSTi0 - 15
CK_int *
FP8o
C8o
STo delay - Active to High-Z
Output Driver Enable (ODE)
Delay to Active Data
Output Driver Enable (ODE)
Delay to High-Impedance
Characteristic
Ch31
Ch127
Bit0
Bit1
1
- High-Z to Active
Ch31
Bit0
Figure 26 - ST-BUS Local Data Timing Diagram (8Mb/s, 4Mb/s, 2Mb/s)
Ch63
Bit0
Ch63
Bit0
Ch127
Bit0
0
tLFBOS
Ch0
Bit7
tLSOD8
tLIDS4
tLSOD4
7
tLSOD2
Sym
t
t
ODE
t
t
ODZ
Bit7
Ch0
DZ
ZD
tLSIS8
tLIDS8
tLSIH8
Bit7
Ch0
tLIDS2
Bit6
Ch0
6
Min
tLSIS4
tLSIH4
Ch0
Bit7
Bit5
Ch0
Typ
10
10
13
13
5
L
Ch0
Bit7
, with timing corrected to cancel time taken to discharge C
Ch0
Bit6
Max
Ch0
Bit6
tLSIS2
Ch0
Bit4
4
tLSIH2
Unit
ns
ns
ns
ns
s
Ch0
Bit3
3
R
R
R
Ch0
Bit5
L
L
L
=1K, C
=1K, C
=1K, C
Bit5
Ch0
Ch0
Bit2
Test Conditions
2
L
L
L
=30pF, See Note 1
=30pF, See Note 1
=30pF, See Note 1
Ch0
Bit6
Ch0
Bit1
MT90870
1
Ch0
Bit6
Ch0
Bit4
Ch0
Bit4
L
.
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