M48T08 ST Microelectronics, M48T08 Datasheet - Page 4

• Manufacturer Part Number: M48T08
• Description: 64 Kbit 8Kb x 8 TIMEKEEPER SRAM
• Manufacturer: ST Microelectronics

M48T08, M48T18
Table 5. Capacitance
(T
Notes: 1. Effective capacitance measured with power supply at 5V.
Table 6. DC Characteristics
(T
Notes: 1. Outputs Deselected.
Table 7. Power Down/Up Trip Points DC Characteristics
(T
Notes: 1. All voltages referenced to V
DESCRIPTION (cont’d)
The SOIC and battery/crystal packages are
shipped separately in plastic anti-static tubes or in
Tape & Reel form. For the 28 lead SOIC, the
battery/crystal package (i.e. SNAPHAT) part num-
ber is "M4T28-BR12SH1".
4/19
A
A
A
Symbol
Symbol
Symbol
= 25 C, f = 1 MHz )
= 0 to 70 C; V
= 0 to 70 C)
V
V
t
I
I
V
DR
I
CC1
CC2
V
C
I
LO
V
I
V
PFD
PFD
LI
V
2. Sampled only, not 100% tested.
3. Outputs deselected.
2. Measured with Control Bits set as follows: R = ’1’; W, ST, FT = ’0’.
3. Negative spikes of –1V allowed for up to 10ns once per Cycle.
4. The INT pin is Open Drain.
SO
2. At 25°C
CC
C
IL
IO
OH
(2)
OL
IH
(1)
(3)
IN
(1)
(2)
(2)
(3)
Power-fail Deselect Voltage (M48T08)
Power-fail Deselect Voltage (M48T18)
Battery Back-up Switchover Voltage
Expected Data Retention Time
Input Leakage Current
Output Leakage Current
Supply Current
Supply Current (Standby) TTL
Supply Current (Standby) CMOS
Input Low Voltage
Input High Voltage
Output Low Voltage
Output Low Voltage (INT)
Output High Voltage
Input Capacitance
Input / Output Capacitance
CC
= 4.75V to 5.5V or 4.5V to 5.5V)
(1, 2)
Parameter
Parameter
SS
.
Parameter
(4)
Test Condition
V
E1 = V
V
E1 = V
0V
OUT
Test Condition
E2 = V
0V
IN
Outputs open
I
I
I
OL
OL
OH
= 0V
As Figure 3 shows, the static memory array and the
quartz controlled clock oscillator of the M48T08/18
are integrated on one silicon chip. The two circuits
are interconnected at the upper eight memory lo-
cations to provide user accessible BYTEWIDE
clock information in the bytes with addresses
1FF8h-1FFFh.
= 0V
V
= 2.1mA
= 0.5mA
V
IH
= –1mA
OUT
CC
SS
IN
, E2 = V
– 0.2V,
+ 0.2V
(1)
V
V
Min
4.5
4.2
CC
10
CC
IL
Min
–0.3
Typ
Min
4.6
4.3
3.0
2.2
2.4
V
Max
10
10
CC
Max
4.75
Max
4.5
0.8
0.4
0.4
80
3
3
+ 0.3
1
5
YEARS
Unit
Unit
Unit
pF
pF
mA
mA
mA
V
V
V
V
V
V
V
V
A
A