IL9270
TIMING REQUIREMENTS (All Voltages referenced to GND. VCC = 5.0 V, GND = 0 V, TA = -10 to +70°C,
FCLK = 3.579545 Mhz, using test circuit of Figure 5)
Symbol
Parameter
Guaranteed
Limits
Min
5
Max
Unit
ms
Notes
Refer to
Fig. 7
tDP
tDA
Tone Present Detection Time (Figure 7)
Tone Absent Detection Time (Figure 7)
Maximum Tone Detection Accept (Figure 7)
18
10
40
0.5
ms
tREC
ms
(User
Adjustable)
tREC
tID
Minimum Tone Detection Reject (Figure 7)
Maximum Interdigit Pause Accept (Figure 7)
20
20
ms
ms
40
Refer to
“Guard Time
tDO
tPQ
Minimum Interdigit Pause Reject (Figure 7)
ms
µs
µs
µs
ns
Adjustment”
OE = VCC
Maximum Propagation Delay (St to Q) (Figure 7)
Maximum Propagation Delay (St to StD) (Figure 7)
Maximum Output Data Set Up (Q to StD) (Figure 7)
11
16
5
tPSED
tQSED
tPTE
Maximum
ENABLE
75
RL= 10 KΩ
CL= 50 pF
Propagation Delay
tPTD
fCLK
CLO
(OE to Q) (Figure 7) DISABLE
Crystal/Clock Frequency
460
ns
3.5759 3.581 MHz
30 pF
Clock Output (C2)
Capacitive
Load
Notes:
1. dBm = decibels above or below a reference power of 1 mW into a 600 Ω 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 amlitude.
6. Tone pair is deviated by ±1.5% ±2 Hz.
7. Bandwidth limited (3 KHz) Gaussian Noise.
8. The precise dial tone frequencies are (350 Hz and 440 Hz) ±2%.
9. For an error rate of less than 1 in 10,000.
10. Referenced to the lowest level frequency component in DTMF signal.
Figure 1. Typical Filter Characteristic
INTEGRAL [ INTEGRAL CORP. ]
