QT1123L
Q-TECH
CORPORATION
CMOS, LOW CURRENT HIGH-TEMPERATURE REAL TIME CLOCK
I
2
C SERIAL BUS INTERFACE
3.3Vdc
Description
The QT1123 Real-Time Clock provides a time/calendar
function, a 32 byte static RAM, and a 3 wire Serial
Peripheral Interface (SPI Bus). The part is designed for
high temperature applications with the on-board oscillator
operating with a 32.768kHz output and the CMOS Serial
Real-Time Clock. The time registers hold seconds,
minutes, and hours, while the calendar registers hold day-
of-week, date, month, and year information. The data is
stored in BCD format. Other functions included alarm
programmed to occur at a predetermined combination of
seconds, minutes, and hours, the interrupt function, power
fail detect with switching battery back-up power.
Features
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Made in the USA
ECCN: EAR99
+3.3Vdc operation
32.768kHz square wave output
Wide operating temperature (-55°C to +185°C)
Very good stability
Low current 90µA at +25°C
SPI (Serial Peripheral Interface)
Full Clock Features (Seconds, Minutes, Hours, Day, Week,
Month, Year)
32 Wordx8 bit RAM
Seconds, Minutes, Hours Alarm
Automatic Power Loss Detection
Low minimum Standby (Timekeeping) Voltage at 2.2V
Buffered Clock Output
Battery supply that powers oscillator and also connects to
Vdd pin when power fails
Three Independent Interrupt Modes
- Alarm
- Periodic
- Power-Down Sense
Electrical Parameters
Parameters
Output freq. (Fo)
Supply voltage (Vdd)
3.3Vdc ± 10%
See Option codes
See Option codes
65µA Typ. at 25ºC
180µA max @185ºC, VDD = 3.3Vdc,25ºC
70µA max, VBATT = 2.3Vdc
20 ns typ.
100 ns max.
(Measured from 10% to 90%)
15pF // 10kΩ
10µs max.
Voh = 2.4Vdc min.
Vol = 0.1 x Vdd max.
± 1mA min.
45/55% max.
-62ºC to + 150ºC
+5Vdc
Rating
32.768kHz
Maximum Applied Voltage
(Vdd max.)
Freq. stability (∆F/∆T)
Storage temp. (Tsto)
Operating temp. (Topr)
Operating supply current
(Idd) (No Load)
Symmetry
(50% of ouput waveform )
Rise and Fall times (Tr/Tf)
(with typical load)
Output Load
Start-up time (Tstup)
Output voltage (Voh/Vol)
Output Current (Ioh/Iol)
Applications
• Data logging
• Real Time Clock functions
QPDS-0014 (Revision B, Sept 2015)
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
1 of 18
QT1123L
Q-TECH
CORPORATION
CMOS, LOW CURRENT HIGH-TEMPERATURE REAL TIME CLOCK
I
2
C SERIAL BUS INTERFACE
3.3Vdc
Package Outline and Pin Connections
Dimensions are in inches (mm)
Pin Pin
No. Name
1
Q-TECH
P/N
FREQ.
D/C S/N
Description
CPU reset output pin. This pin functions as an N-Channel only, open-
drain output and requires an external pull-up resistor.
CPUR
2
CLK
OUT
.200 MAX.
(5.08)
.200
MIN.
(5.08)
.018
(.457)
.600
(15.24)
.880
MAX.
(22.35)
3
4
5
6
SCK
MOSI
MISO
CE
1
7
MAX.
.300 (12.83)
(7.62)
.505
7
8
9
14
8
.100
(2.54)
• Package material (header and leads): Kovar
• Lead finish: Gold Plated – 50µ ~ 80µ inches
Nickel Underplate – 100µ ~ 250µ inches
• Package to lid attachment: Resistance weld
• Cover: Pure Nickel Grade A
• Weight: 3.4g typ.,14.2g max.
Package Information
10
11
12
13
14
Ground pin : Connect this pin to ground
Oscillator Ouput Pin: Use this pin to monitor the internal Oscillator fre-
OUT
quency and power
The oscillator power source. The positive terminal of the battery should
be connected to this pin. When the level on the VSYS pin falls below
VBATT
VBATT + 1.0V, the VBATT pin will be internally connected to the
VDD ppin.
Interrupt output pin:must be tied to an external pull-up resistor.The out-
put is activated to a low level when:
1. Power-sense operation is selected (B5 = 1 in Interrupt Control Regis-
ter) and a power failure occurs.
2. A previously set alarm time occurs. The alarm bit in the Status Regis-
ter and interrupt-out signal are delayed 30.5μs when 32kHz operation is
selected and 15.3μs for 2MHz and 7.6μs for 4MHz.
INT
3. A previously selected periodic interrupt signal activates.The Status
Register must be read to set the Interrupt output high after the selected
periodic interval occurs. This is also true when conditions 1 and 2 acti-
vate the interrupt. If power-down had been previously selected, the in-
terrupt will also reset the power-down functions."Interrupt True"- A
high in this bit signifies that one of the three interrupts (Power Sense,
Alarm, and Clock) is valid
Power-on reset:A Schmitt-trigger input that generates a power-on inter-
POR nal reset signal using an external RC network.power-on-reset selects the
device to be in the single supply or battery backup mode
NC
NC
VDD
No connection
No connection
The positive power-supply pin: Connect this pin to the power supply
GND
Clock output pin:The value in the three least significant bits of the
Clock Control Register selects one of seven possible output frequencies
to be used as the squarewave clock output:
0 = XTAL
4 = Disable (low output)
1 = XTAL/2 5 = 1Hz
2 = XTAL/4 6 = 2H
3 = XTAL/8 7 = 50Hz or 60Hz
XTAL Operation = 64Hz
All bits are reset by a power-on reset, therefore, the XTAL is selected as
the clock output at this time.
Serial Clock Input:This input causes serial data to be latched from the
MOSI input and shifted out on the MISO output
Master Out/Slave In:Data bytes are shifted in at this pin, most signifi-
cant bit (MSB) first.The Address/Control and Data bytes are shifted
MSB first, Into the serial data input (MOSI) and out of the serial data
output (MISO).Data is transferred into MOSI for a Write operation
Master In/Slave Out:Data bytes are shifted out at this pin, most signifi-
cant bit (MSB) first.The Address/Control and Data bytes are shifted
MSB first, Into the serial data input (MOSI) and out of the serial data
output (MISO).Data is transferred out of MISO for a Read operation.
Chip-enable input:A low level at this input holds the serial interface
logic in a reset state, and disables the output driver at the MISO pin
QPDS-0014 (Revision B, Sept 2015)
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
2 of 18
QT1123L
Q-TECH
CORPORATION
CMOS, LOW CURRENT HIGH-TEMPERATURE REAL TIME CLOCK
I
2
C SERIAL BUS INTERFACE
3.3Vdc
Ordering Information
Q T1123 L8 0M -3 2.7 68k Hz
Q T 1123 L 80 M - 32 .76 8k Hz
Solder Dip Option:
T = Standard
S = Solder Dip
(*)
G = Solder Dip
(*)
Part Number
L=3.3Vdc
80
81
82
83
84
85
86
87
88
89
90
91
92
=
=
=
=
=
=
=
=
=
=
=
=
=
±40ppm
±75ppm
±40ppm
±75ppm
±75ppm
±75ppm
±100ppm
±150ppm
±200ppm
±250ppm
±200ppm
±250ppm
±250ppm
Output Frequency
(Sample part number)
Screening Option:
Blank = No Screening
M
= Per MIL-PRF-55310, Level B
Operating Temperature Option:
@ 0ºC to +175ºC (Operable up to + 185ºC)
@ 0ºC to +175ºC (Operable up to + 185ºC)
@ -20ºC to +175ºC (Operable up to + 185ºC)
@ -20ºC to +175ºC (Operable up to + 185ºC)
@ 0ºC to +185ºC
@ -20ºC to +185ºC
@ -20ºC to +185ºC
@ -20ºC to +185ºC
@ -20ºC to +175ºC (Operable up to + 185ºC)
@ -40ºC to +175ºC (Operable up to + 185ºC)
@ -40ºC to +185ºC
@ -40ºC to +185ºC
@ -55ºC to +185ºC
For Non-Standard requirements,
contact Q-Tech Corporation
at Sales@Q-Tech.com
• Standard packaging in black foam
• Optional anti-static plastic tube
Packaging Options
(*) Hot Solder Dip options for an additional cost:
S = Sn60/Pb40 per MIL-PRF 55310
G = Lead free Alloy SAC305 (96.5% Sn, 3% Ag, 0.5% Cu)
QPDS-0014 (Revision B, Sept 2015)
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
• Lead forming available. Please contact for details.
• Lead trimming
• P. I. N. D. test (MIL-STD 883, Method 2020)
Other Options Available For An Additional Charge
3 of 18
QT1123L
Q-TECH
CORPORATION
CMOS, LOW CURRENT HIGH-TEMPERATURE REAL TIME CLOCK
I
2
C SERIAL BUS INTERFACE
3.3Vdc
Output Waveform (Typical)
Startup Time
Fall Time
Rise Time
Chart vs. Nominal
QPDS-0014 (Revision B, Sept 2015)
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
4 of 18
QT1123L
Q-TECH
CORPORATION
CMOS, LOW CURRENT HIGH-TEMPERATURE REAL TIME CLOCK
I
2
C SERIAL BUS INTERFACE
3.3Vdc
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
QPDS-0014 (Revision B, Sept 2015)
5 of 18
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