isppac81 Lattice Semiconductor Corp., isppac81 Datasheet - Page 6

• Manufacturer Part Number: isppac81
• Description: In-system Programmable Analog Circuit
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
Timing Specifications (JTAG Interface Mode)
T
*Note: During device JTAG programming, analog output response will deviate from expected behavior. This is
because all configuration information is erased and then re-written as part of a normal programming cycle, momen-
tarily changing device filter and gain parameters. Behavior will deviate from that expected during both of these
steps since the analog outputs are not clamped during a programming cycle. During erase, a drop in the filter cor-
ner frequency and an automatic change to the 10X gain setting can be expected (80ms minimum by specification)
and will continue until bits go to their final state after a JTAG write command is issued (less than 2ms later, though
the write cycle must still be maintained for a full 80ms to achieve specified data retention).
Dynamic Performance
tckmin
tckh
tckl
tmss
tmsh
tdis
tdih
tdozx
tdov
tdoxz
tpwp
tpwe
tpwcal1
tcalmin
tpwcal2
A
Symbol
= 25°C; V
TCK
TMS
TDI
TDO
Minimum clock period
TCK high time
TCK low time
TMS setup time
TMS hold time
TDI setup time
TDI hold time
TDO float to valid delay
TDO valid delay
TDI valid to float delay
Time for a programming operation
Time for an erase operation
Time for auto-cal operation on power-up
Minimum auto-cal pulse width
Time for user-initiated auto-cal operation
S
= +5.0V (Unless otherwise specified)
tmss
tdis
tdozx
tmsh
tdih
tckh
Parameter
tdov
tckl
tckmin
tdoxz
Automatically executed at power-up
Executed on rising edge of CAL
Executed in Run-Test/Idle
Executed in Run-Test/Idle
6
CAL
V OUT
TCK
TMS
Condition
tmss
tcalmin
*(PRGUSR/UBE executed in
Run-Test/Idle state)
tpwp, tpwe
V
tpwcal1, tpwcal2
OUT+
(Note: CAL internally
initiated at device turn-on.)
= V
Min.
200
50
50
15
10
15
10
80
80
40
OUT–
ispPAC81 Data Sheet
= 0
Typ.
tmss
Max.
100
100
250
100
60
60
60
Units
ms
ms
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns