DS1500 Maxim, DS1500 Datasheet - Page 6

• Manufacturer Part Number: DS1500
• Description: The DS1500 is a full-function, year 2000-compliant, real-time clock/calendar (RTC) with an alarm, watchdog timer, power-on reset, battery monitors, 256 bytes of on-board nonvolatile (NV) SRAM, NV control for backing up an external SRAM, and a 32
• Manufacturer: Maxim

Figure 4. Burst Mode Timing Waveform
POWER-UP/DOWN CHARACTERISTICS
CAPACITANCE
(T
AC TEST CONDITIONS
OE, WE, OR CS
CS, CEI, or WE at V
V
V
V
V
Capacitance on All Input Pins
Capacitance on IRQ, PWR, RST, and DQ Pins
A
CCI
CCI
CCI
PF
= +25°C)
(W) 25pF + 1 TTL Gate
(Y) 50pF + 1TTL Gate
DQ0–DQ7
to RST High
Fall Time: V
Fall Time: V
Rise Time: V
OUTPUT LOAD
A0–A4
PARAMETER
PF(MAX)
PF(MIN)
PARAMETER
PF(MIN)
IH
Before Power-Fail
to V
to V
to V
SO
PF(MIN)
PF(MAX)
INPUT PULSE
13h
PW
0V to 3.0V for
5V operation
LEVELS
LOW
SYMBOL
PW
t
t
t
REC
t
t
PF
FB
R
F
HIGH
SYMBOL
6 of 20
(Figure 5)
C
C
IN
IO
TIMING MEASUREMENT
REFERENCE LEVELS
CONDITIONS
Output: 1.5V
Input: 1.5V
MIN
MIN
300
10
35
TYP
0
0
TYP
INPUT PULSE RISE
AND FALL TIMES
MAX
10
10
MAX
200
5ns
UNITS
UNITS
pF
pF
ms
µs
µs
µs
µs