MT8880C Mitel Networks Corporation, MT8880C Datasheet - Page 16

• Manufacturer Part Number: MT8880C
• Description: Integrated DTMFTransceiver
• Manufacturer: Mitel Networks Corporation

MT8880C/MT8880C-1
† 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 t
#
NOTES: 1) dBm=decibels above or below a reference power of 1 mW into a 600 ohm load.
4-48
AC Electrical Characteristics
28
29
30
31
32
33
34
35
See Figure 6 regarding guard time adjustment.
D
M
C
T
F
L
K
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.
Data hold time (write)
Input Capacitance (data bus)
Output Capacitance (IRQ/CP)
Crystal/clock frequency
Clock input rise time
Clock input duty cycle
Clock input duty cycle
Capacitive load (OSC2)
Characteristics
†
(Cont‘d) -
ISO
DC
C
t
t
t
Sym
2
LHCL
HLCL
C
DHW
C
OUT
f
-CMOS
C
LO
IN
CL
Voltages are with respect to ground (V
3.5759
Min
10
40
DHR
.
3.5795
Typ
50
5
5
‡
3.5831
Max
110
110
60
30
SS
) unless otherwise stated.
Units
MHz
pF
pF
pF
ns
ns
ns
%
Ext. clock
Ext. clock
Ext. clock
Notes*