MT8880C
Data Sheet
AC Electrical Characteristics† - Voltages are with respect to ground (VSS) unless otherwise stated.
Characteristics
High group output level
Sym.
Min. Typ.‡ Max. Units
Conditions
dBm RL=10 kΩ
dBm RL=10 kΩ
13
14
15
16
VHOUT
VLOUT
dBP
-6.1
-8.1
0
-2.1
-4.1
3
T
O
N
E
Low group output level
Pre-emphasis
2
dB
dB
RL=10 kΩ
Output distortion (Single Tone)
THD
-35
25 kHz Bandwidth
O
U
T
RL=10 kΩ
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Frequency deviation
fD
RLT
tCYC
tCH
tCL
±0.7
±1.5
%
kΩ
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
pF
fC=3.579545 MHz
Output load resistance
Φ2 cycle period
10
50
250
115
110
M
P
U
Φ2 high pulse width
Φ2 low pulse width
I
Φ2 rise and fall time
tR, F
tAH, RWH
tAS, RWS
t
25
N
T
E
R
F
A
C
E
Address, R/W hold time
Address, R/W setup time (before Φ2)
Data hold time (read)
t
26
23
22
t
tDHR
tDDR
tDSW
tDHW
CIN
*
Φ2 to valid data delay (read)
Data setup time (write)
Data hold time (write)
Input Capacitance (data bus)
Output Capacitance (IRQ/CP)
Crystal/clock frequency
Clock input rise time
100
200 pF load
45
10
5
5
COUT
fC
D
T
M
F
3.5759 3.5795 3.5831 MHz
tLHCL
tHLCL
DCCL
CLO
110
110
60
ns
ns
%
Ext. clock
Ext. clock
Ext. clock
Clock input duty cycle
Clock input duty cycle
Capacitive load (OSC2)
C
L
K
40
50
30
pF
† Timing is over recommended temperature & power supply voltages.
‡ Typical figures are at 25°C and for design aid only: not guaranteed and not subject to production testing.
* The data bus output buffers are no longer sourcing or sinking current by tDHR
See Figure 6 regarding guard time adjustment.
.
#
NOTES: 1) dBm=decibels above or below a reference power of 1 mW into a 600 ohm load.
2) Digit sequence consists of all 16 DTMF tones.
3) Tone duration=40 ms. Tone pause=40 ms.
4) Nominal DTMF frequencies are used.
5) Both tones in the composite signal have an equal amplitude.
6) The tone pair is deviated by ±1.5%±2 Hz.
7) Bandwidth limited (3 kHz) Gaussian noise.
8) The precise dial tone frequencies are 350 and 440 Hz (±2%).
9) For an error rate of less than 1 in 10,000.
10) Referenced to the lowest amplitude tone in the DTMF signal.
11) Referenced to the minimum valid accept level.
12) For guard time calculation purposes.
21
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
