MT8870 Mitel Networks Corporation, MT8870 Datasheet - Page 10

• Manufacturer Part Number: MT8870
• Description: ISO2-CMOS Integrated DTMF Receiver
• Manufacturer: Mitel Networks Corporation

MT8870D/MT8870D-1
‡ Typical figures are at 25°C and are for design aid only: not guaranteed and not subject to production testing.
*NOTES:
1.
2.
3.
4-20
AC Electrical Characteristics
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
Used for guard-time calculation purposes only.
These, user adjustable parameters, are not device specifications. The adjustable settings of these minimums and maximums
With valid tone present at input, t
are recommendations based upon network requirements.
W
M
N
G
O
U
U
D
N
C
O
C
T
T
P
T
S
P
K
L
I
I
Tone present detect time
Tone absent detect time
Tone duration accept
Tone duration reject
Interdigit pause accept
Interdigit pause reject
Propagation delay (St to Q)
Propagation delay (St to StD)
Output data set up (Q to StD)
Propagation delay (TOE to Q ENABLE)
Propagation delay (TOE to Q DISABLE)
Power-up time
Power-down time
Crystal/clock frequency
Clock input rise time
Clock input fall time
Clock input duty cycle
Capacitive load (OSC2)
DTMF
Input
Characteristics
C
1
X-tal
R
R
2
1
Figure 10 - Single-Ended Input Configuration
PU
equals time from PDWN going low until ESt going high.
- V
MT8870D/MT8870D-1
IN+
IN-
GS
V
INH
PDWN
OSC 1
OSC 2
V
DD
Ref
SS
=5.0V±5%, V
V
ISO
DD
2
St/GT
TOE
-CMOS
V
StD
ESt
Q4
Q3
Q2
Q1
DD
DC
t
t
t
SS
Sym
t
t
t
t
t
QStD
LHCL
HLCL
C
PStD
t
t
t
t
REC
REC
PTD
t
t
PTE
t
DP
DA
DO
PQ
PU
PD
f
ID
=0V, -40°C
LO
C
CL
3.5759 3.5795 3.5831
Min
0.5
20
20
40
5
To
+85°C , using Test Circuit shown in Figure 10.
Typ
C
R
300
3.4
11
12
50
30
20
50
2
3
4
8
‡
Max
110
110
8.5
NOTES:
R
R
C
X-tal=3.579545 MHz
14
40
40
11
16
60
30
1
3
1
,R
=300K
,C
2
2
=100K
=100 nF
Units
MHz
ms
ms
ms
ms
ms
ms
ms
ms
pF
ns
ns
ns
ns
µs
µs
µs
%
1%
1%
5%
Note 1
Note 1
Note 2
Note 2
Note 2
Note 2
TOE=V
TOE=V
TOE=V
load of 10 k ,
50 pF
load of 10 k ,
50 pF
Note 3
Ext. clock
Ext. clock
Ext. clock
Conditions
0.1%
DD
DD
DD