MT8880C/MT8880C-1 ISO2-CMOS
AC Electrical Characteristics† (Cont‘d) - Voltages are with respect to ground (VSS) unless otherwise stated.
‡
Characteristics
Sym
Min
Typ
Max
Units
Notes*
28
29
30
31
32
33
34
35
Data hold time (write)
t
10
ns
pF
pF
MHz
ns
DHW
Input Capacitance (data bus)
Output Capacitance (IRQ/CP)
Crystal/clock frequency
Clock input rise time
C
5
5
IN
C
OUT
f
3.5759 3.5795 3.5831
D
T
M
F
C
t
t
110
110
Ext. clock
LHCL
HLCL
Clock input duty cycle
Clock input duty cycle
Capacitive load (OSC2)
ns
Ext. clock
Ext. clock
C
L
K
DC
40
50
60
%
CL
C
30
pF
LO
† 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.
4-48
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