FM573 Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – Nonvolatile Octal Latch/Register

Preliminary
FM573/574
Nonvolatile Octal Latch/Register
Features
8-bit Nonvolatile Latch
• Logic state is preserved in the absence of power
• Over 10 Billion (10¹⁰) nonvolatile state changes
• Advanced high-reliability ferroelectric process
Operates like conventional CMOS logic
• Transparent (573) or D-Flip-flop (574) operation
• FM573 transparent for C high, latched for C low
• FM574 data is clocked on the rising edge of C
• 33/80 ns data propagation delay (5V/3V)
• 30 MHz/12 MHz Maximum frequency (5V/3V)
Description
The FM573 and FM574 are innovative circuits that
store inputs like conventional logic families, and then
retain the stored state in the absence of power. These
products solve three basic problems in an elegant
fashion. First, they provide continuous access to
nonvolatile system settings without performing a
memory read operation or using dedicated processor
I/O pins. Second, they allow the storage of signals or
data that may change frequently and possibly without
notice. Third, they allow the nonvolatile storage of a
few bits of data or system settings without the system
overhead and extra pins of a serial memory. The
FM573 is a transparent latch. The inputs are passed
to the outputs when the clock is high; the state is
latched when the clock goes low. The FM574 is a D-
type register. Inputs are stored and passed to the
outputs on the rising edge of the clock. The
nonvolatile latch is a unique product that serves a
variety of applications. A few ideas as follows:
ü Controls relays and valves with automatic setting
on power-up without processor intervention.
ü Interface to soft/momentary front-panel switches
and indicator lamps. Capture switch settings and
light LED’s without processor intervention.
ü Replaces jumpers & control signal routing
ü Initialize state of I/O card signals.
ü Save system errors or status codes when power
fails with a fast, no overhead write and automatic
restore on power up.
ü Eliminate the overhead of serial memory for
systems needing only a few bits of data.
The FM573 and FM574 are provided in a 20-pin DIP
or SOP. They are rated from –40C to +85C.
Automatic Nonvolatile Operation
• Latched state is stored automatically
• State is automatically restored on power-up
• Power supply monitor prevents low-VDD writes
Low Power Operation
• Supply voltage of 2.7V to 5.5V
• 125 µA standby current
Industry Standard Configuration
• Industrial temperature -40° C to +85° C
• 20-pin SOP or DIP
Pin Configuration
OE 1
D0 ²
D1 ³
D2 4
D3 5
D4 6
D5 7
D6 8
D7 ⁹
VSS ¹⁰
20 VDD
19 _Q0
18 _Q1
17 Q2
16 Q3
15 Q4
14 Q5
13 Q6
12 _Q7
11 _C
Pin Names
D0-D7
Q0-Q7
C
/OE
VSS
VDD
Function
Data in
Data Out
Clock/Latch Enable
Output enable
Ground
Supply Voltage
Ordering Information
FM573-P Transparent latch, 20-pin plastic DIP
FM573-S Transparent latch, 20-pin SOP
FM574-P Register, 20-pin plastic DIP
FM574-S Register, 20-pin SOP
Other package types may be available. Contact
the factory for more information.
This data sheet contains specifications for a product under development.
Characterization is not complete; specifications may change without notice.
27 March 2001
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, [phone], Fax [phone]
www.ramtron.com
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