U3761MB-T Datasheet, PDF (22/27 Pages) ATMEL Corporation – Universal Telephone IC - All Functions Integrated

DC Characteristics Dialer (Continued)
V_DD = 2.7 V, f_OSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Isolation resistance XT/XT
Riso
4.7
MW
Maximum voltage at HKS
5.5
V
Maximum input current at HKS
0.5
mA
AC Characteristics Dialer
V_DD = 2.7 V, f_OSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Keypad active in debounce mode
Key release debounce
Pre-digit pause
Inter-digit pause (auto dialing)
Make/break ratio
MODE pin = R3 (10 pps)
MODE pin = C1, C4 (10 pps)
MODE pin = R1 (20 pps)
MODE pin = R2
10 pps, t_IP = t_IDP + t_PDP
20 pps
MODE pin = R1 (20 pps), R3 10 pps)
MODE pin = C1, R4 (10 pps) R2
(20 pps)
t_KID
15
20
25
ms
t_KRD
15
20
25
ms
t_PDP
37
40
41
ms
t_PDP
31
33.3
33.5
ms
t_PDP
20
ms
t_PDP
16.65
ms
t_IP
t_IP
810
836
512
860
ms
ms
40.8:60.2 40:60 39.2:60.8 %
M/B
35.6:64.4 33:67 31.2:68.8 %
DTMF output duration
Auto dialing, MODE = C4
MODE = C3
t_TD
84
84
87
87
90
90
ms
Inter-tone pause
Auto dialing, MODE = C4
MODE = C3
t_ITP
84
87
90
135
140
147
ms
Flash break time
F1
F2
F3
Rise time of leading edge at HKS
Flash pause time
Pause time
On-hook debounce time
Earth time
Earth pause time
Break duration
C₁ connected to GND
C₂ connected to GND
C₃ connected to GND
20 to 70% of VDD
F1, F2, F3
C₄ connected to GND
MODE pin = R3
MODE pin = C1, R4
MODE pin = R1 (20 pps)
MODE pin = R2
t_FB
t_rHKS
t_FP
t_P
t_ohd
t_et
t_pt
t_B
t_B
95
98
101
ms
245
250
255
ms
590
604
610
ms
10
ms
0.9
1
1.1
s
3.5
3.6
3.7
s
145
165
185
ms
604
ms
0.9
1
1.1
s
57.6
60
62.4
ms
63
66.7
69
ms
30
ms
33.35
ms
Make duration
Break + make duration
MODE pin = R3
MODE pin = C1, R4
MODE pin = R1 (20 pps)
MODE pin = R2
MODE pin = C1, R3, R4
MODE pin = R1, R2 (20 pps)
t_M
38
40
41
ms
31
33.3
35
ms
t_M
20
ms
16.65
ms
t_P
95
100
105
ms
t_P
50
ms
22 U3761MB-T
4744A–CORD–09/03