U3750BM
TELEFUNKEN Semiconductors
Electrical Characteristics of Logical Part
f
= 455 kHz (other specifications as under electrical characteristics)
clock
Parameters
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
V
2.4
1.9
2.75
2.2
2.5
3.5
2.9
2.3
V
V
V
V
RAM
Speed-up off threshold
Speed-up on threshold
Logic operating voltage in
normal mode
I = 8 mA
I = 15 to 70 mA
L
V
SOFF
L
V
SON
I
RAM
Oscillator on
Leakage
V
RAM
= 3.5 V
800
300
A
A
Inputs: C1, C2, C3, C4,
C5, C6, DC/FV, FLASH
Input voltage low, V
Input voltage high, V
0.2
V
V
IL
0.8
V
RAM
IH
V
RAM
Keyboard pins: C1, C2,
C3, C4, C5, C6
Internal pull down
Output current
V
V
= 3.5 V
= 0 V
15
0.8
50
2.5
A
A
IL
IH
FLASH, DC/FV
Internal pull-up current
IPV
V
V
= 0 V
= 3.5 V
0.5
5
1
A
IL
IH
Leakage current
Timing and frequency
Reset time t (see figure 6
and 7)
In mode 60/40
In mode 66/33 and DTMF mode
30
33
5
ms
ms
ms
r
Clock start-up time t
on
Time line break generating
a reset: t
In mode 60/40
In mode 66/33 and DTMF mode
In mode 60/40
290
319
14
300
330
34
ms
ms
ms
ms
lb
Debounce time, t
24
26.4
e
In mode 66/33 and DTMF mode
15.4
37.4
RESET output (with 390
series)
Output low current
Output high current
V
OL
V
OL
= 2.5 V
= 0.5 V
I
I
0.25
0.25
1.2
1.2
mA
mA
OL
OH
OL output
Output low current
Output high current
V
OL
= 0.5 V
I
I
2
1
20
4
A
mA
OL
OH
MF output
High impedance
V
= 1.4 V
0.5
350
550
550
350
A
A
A
A
A
OHI
FL = L, FH = H, V = 3.5 V
FB = L, FH = H, V = 0 V
FB = H, FH = L, V = 3.5 V
FB = H, FH = L, V = 0 V
150
200
200
150
OH
OH
OH
OH
CK Input
Low input leakage
High input leakage
V
IL
V
IL
= 0.5 V
= 3.0 V
1
1
A
A
10 (20)
Rev. A1: 16.07.1996
TEMIC [ TEMIC SEMICONDUCTORS ]
