Tclk, Tclkh, Tclkl – Mitel DISTRIBUTED HYPERCHANNEL MT90840 User Manual
Page 33: Tfrs, Tfrh, Tfrw, Preliminary information
Preliminary Information
MT90840
2-263
AC Electrical Characteristics
- Voltages are with respect to ground (V
SS
) unless otherwise stated.
Characteristics
Sym
Min
Typ
‡
Max
Units
Test Conditions
1
C4/8 Input - Clock Period:
4.096 MHz (2.048 & 4.096 Mbps)
8.192 MHz (8.192 Mbps)
SPCKo Output - Clock Period from
internal divider (2.048 & 4.096 Mbps)
SPCKo Output - Clock Period
generated from external C4/8
reference (2.048 and 4.096 Mbps)
t
clk
200
100
224
241
244
122
259
245
ns
ns
ns
ns
C4/8R1 or C4/8R2
19.44 MHz 60/40%
duty-cycle clock at
PCKR
C4/8R1 input with 244 ns
cycle
2
C4/8 Input Clock Width HIGH
4.096 MHz (2.048 & 4.096 Mbps)
8.192 MHz (8.192 Mbps)
SPCKo Output - Clock Width HIGH
from internal divider (2.048 & 4.096
Mbps)
SPCKo Output - Clock Width HIGH
generated from external C4/8
reference (2.048 and 4.096 Mbps)
t
clkh
85
50
101
110
122
61
135
ns
ns
ns
ns
C4/8R1 or C4/8R2
19.44 MHz 60/40%
duty-cycle clock at
PCKR
C4/8R1 input with min.
115 ns semi-cycle
3
C4/8 Input - Clock Width LOW
4.096 MHz (2.048 & 4.096 Mbps)
8.192 MHz (8.192 Mbps)
SPCKo Output - Clock Width LOW from
internal divider (2.048 & 4.096 Mbps)
SPCKo Output - Clock Width LOW
generated from external C4/8
reference (2.048 and 4.096 Mbps)
t
clkl
85
50
101
110
122
61
135
ns
ns
ns
ns
C4/8R1 or C4/8R2
PCKR with 60/40% duty
cycle
C4/8R1 input with
minimum 115 ns
half-cycle
4
CLK rise/fall time
t
t
5
ns
5
F0 output delay from SPCKo
(TM2 & TM3, 2.048 and 4.096 Mbps)
F0 output delay from C4/8 input
(TM2 & TM3, 8.192 Mbps)
t
df
32
51
30
46
ns
ns
C
L
=30pF
C
L
=150pF
C
L
=30pF
C
L
=150pF
6
F0i Setup Time from C4/8 input edge
TM1
TM2 with SFDI =1
t
frs
0
28
ns
ns
C4/8 falling edge
7
F0i Hold Time from C4/8 input edge
TM1
TM2 with SFDI =1
t
frh
8
0
ns
ns
C4/8 falling edge
C4/8 rising or falling
8
F0i Input Frame Pulse Width
2.048, 4.096, 8.192 Mbps
t
frw
35
ns
9
STo Delay - Active to High-Z,
2.048 and 4.096 Mbps (TM2 &TM3)
2.048 and 4.096 Mbps (TM1)
8.192 Mbps (STio0-3)
t
az
38
50
26
ns
ns
ns
C
L
=30pF, R
L
=1K