Dallas DS1077U-125 Econoscillator/divider Datasheet

DS1077
EconOscillator/Divider
www.maxim-ic.com
PIN ASSIGNMENT
FEATURES
§
§
§
§
§
§
§
§
§
§
§
§
Processor-controlled or standalone solidstate oscillator
Frequency changes on-the-fly
Dual low-jitter, synchronous fixed
frequency outputs
2-wire serial interface
Frequency outputs 8.1kHz to 133MHz
±0.5% variation over temp (+25°C to
+70°C)
±0.5% initial tolerance
Nonvolatile (NV) frequency settings
Single 5V supply
No external components
Power-down mode
Synchronous output gating
STANDARD FREQUENCY OPTION
Note: x denotes package option
DS1077x-133 133.333MHz to
DS1077x-125 125.000MHz to
DS1077x-120 120.000MHz to
DS1077x-100 100.000MHz to
DS1077x-66
66.666MHz to
16.2kHz
15.2kHz
14.6kHz
12.2kHz
8.1kHz
OUT1
1
8
SCL
OUT0
2
7
SDA
VVCC
DD
3
6
CTRL1
GND
4
5
CTRL0
150mil SO
118mil µSOP Package
PIN DESCRIPTION
OUT1
OUT0
VCC
GND
CTRL1
CTRL0
SDA
SCL
- Main Oscillator Output
- Reference Output
- Power Supply Voltage
- Ground
- Control Pin for OUT1
- Control Pin for OUT0
- 2-Wire Serial Data
Input/Output
- 2-Wire Serial Clock
ORDERING INFORMATION
Note: XXX denotes frequency option
DS1077Z-XXX
8-Pin 150mil SO
DS1077U-XXX
8-Pin 118mil µSOP
DESCRIPTION
The DS1077 is a dual-output, programmable, fixed-frequency oscillator requiring no external
components for operation. The DS1077 can be used as a processor-controlled frequency synthesizer or
as a standalone oscillator. The two synchronous output operating frequencies are user-adjustable in
submultiples of the master frequency through the use of two on-chip programmable prescalers and a
divider. The specific output frequencies chosen are stored in NV (EEPROM) memory. The DS1077
defaults to these values upon power-up.
The DS1077 features a 2-wire serial interface that allows in-circuit on-the-fly programming of the
programmable prescalers (P0 & P1) and divider (N) with the desired values being stored in NV
(EEPROM) memory. Design changes can be accommodated in-circuit on-the-fly by simply
programming different values into the device (or reprogramming previously programmed devices).
Alternatively, for fixed frequency applications, previously programmed devices can be used and no
connection to the serial interface is required. Pre-programmed devices can be ordered in customerrequested frequencies.
The DS1077 is available in 8-pin SO or µSOP packages, allowing the generation of a clock signal
easily, economically, and using minimal board area. Chip-scale packaging is also available on request.
EconOscillator is a trademark of Dallas Semiconductor.
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022703
DS1077
BLOCK DIAGRAM 1077 Figure1
CONTROL
LOGIC
(TABLE 1)
SEL0
EN0
PDN0
INTERNAL
OSCILLATOR
Enable
Select
DIV1
MCLK
Power-Down
0M1
0M0
1M1
CTRL0
P0 PRESCALER
(M DIVIDER)
MUX
OUT0
1M0
EN0
SEL0
PDN0
0M1
0M0
DIV1
PDN1
CONTROL
REGISTERS
PROGRAMMABLE
“N” DIVIDER
P1 PRESCALER
(M DIVIDER)
2-WIRE
INTERFACE
Power-Down
1M1
1M0
PDN1
SDA
Enable
CONTROL
LOGIC
(TABLE 2)
SCL
2 of 21
OUT1
CTRL1
DS1077
OVERVIEW
A block diagram of the DS1077 is shown in Figure 1. The DS1077 consists of four major components:
1) Internal Master Oscillator, 2) Prescalers, 3) Programmable Divider, and 4) Control Registers.
The internal oscillator is factory-trimmed to provide a master frequency (Master CLK) that can be routed
directly to the outputs (OUT0 & OUT1) or through separate prescalers (P0 & P1). OUT1 can also be
routed through an additional divider (N).
The Prescaler (P0) divides the Master Clock by 1, 2, 4, or 8 to be routed directly to the OUT0 pin.
The Prescaler (P1) divides the Master Clock by 1, 2, 4, or 8, which can be routed directly to the OUT1 pin
or to the Divider (N) input, which is then routed to the OUT1 pin.
The Programmable Divider (N) divides the Prescaler Output (P1) by any number selected between 2 and
1025 to provide the Main Output (OUT1) or it can be bypassed altogether by use of the DIV1 register bit.
The value of N is stored in the DIV register.
The Control Registers are user-programmable through a 2-wire serial interface to determine operating
frequency (values of P0, P1, & N) and modes of operation. The register values are stored in EEPROM
and therefore only need to be programmed to alter frequencies and operating modes.
PIN DESCRIPTIONS
Output 1 (OUT1)—This pin is the main oscillator output; its frequency is determined by the control
register settings for the prescaler P1 (mode bits 1M1 & 1M0) and divider N (DIV word).
Output 0 (OUT0)—A reference output, OUT0, is taken from the output of the reference select Mux. Its
frequency is determined by the control register settings for CTRL0 and values of Prescaler P0 (mode bits
0M1 & 0M0) (see Table 1).
Control Pin 0 (CTRL0)—A multifunctional input pin that can be selected as a MUX SELECT,
OUTPUT ENABLE and/or a POWER-DOWN. Its function is determined by the user-programmable
control register values EN0, SEL0, and PDN0 (see Table 1).
Control Pin 1 (CTRL1)—A multifunctional input pin that can be selected as a OUTPUT ENABLE
and/or a POWER-DOWN. Its function is determined by the user-programmable control register value of
PDN1 (see Table 2).
Serial Data Input/Output (SDA)—Input/Output pin for the 2-wire serial interface used for data transfer.
Serial Clock Input (SCL)—Input pin for the 2-wire serial interface used to synchronize data movement
on the serial interface.
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DS1077
DEVICE MODE USING OUT0 Table 1
EN0
(BIT)
SEL0
(BIT)
PDN0
(BIT)
0
0
0
CTRL0
(PIN)
1
OUT0
(PIN)
HI-Z
0
HI-Z
CTRL0
FUNCTION
POWERDOWN*
DEVICE
MODE
POWER-DOWN
ACTIVE
1
MCLK/M
MUX SELECT
ACTIVE
0
MCLK
1
HI-Z
OUTPUT
1
0
0
ACTIVE
ENABLE
0
MCLK
1
HI-Z
OUTPUT
1
1
0
ACTIVE**
ENABLE
0
MCLK/M
1
HI-Z
POWER-DOWN
POWERX
0
1
DOWN
0
MCLK
ACTIVE
1
HI-Z
POWER-DOWN
POWERX
1
1
DOWN
0
MCLK/M
ACTIVE
*This mode is for applications where OUT0 is not used, but CTRL0 is used as a device shutdown.
**Default Condition
0
1
0
DEVICE MODE USING OUT1 Table 2
PDN1
(BIT)
CTRL1
(PIN)
CTRL1
FUNCTION
OUT1
DEVICE MODE
0
0
OUTPUT ENABLE
OUT CLK
ACTIVE**
0
1
OUTPUT ENABLE
HI-Z
ACTIVE**
1
0
POWER-DOWN
OUT CLK
ACTIVE
1
1
POWER-DOWN
HI-Z
POWER-DOWN
**Default Condition
NOTE:
Both CTRL0 and CTRL1 can be configured as power-downs. They are internally “OR” connected so that
either of the control pins can be used to provide a power-down function for the whole device, subject to
appropriate settings of the PDN0 and PDN1 register bits (see Table 3).
4 of 21
DS1077
SHUTDOWN CONTROL WITH PDN0 AND PDN1 Table 3
PDN0
PDN1
SHUTDOWN CONTROL
(BIT)
(BIT)
0
0
NONE*
0
1
CTRL1
1
0
CTRL0
1
1
CTRL0 OR CTRL1
*CTRL0 performs a power-down if SEL0 and EN0 are both 0 (see Table 1).
REGISTER FUNCTIONS
The user programmable registers can be programmed by the user to determine the mode of operation
(MUX), operating frequency (DIV), and bus settings (BUS). Details of how these registers are
programmed can be found in a later section; in this section the functions of the registers are described.
The register settings are nonvolatile, the values being stored automatically or as required in EEPROM
when the registers are programmed via the SDA and SCL pins.
MUX WORD
MSB
Name
* PDN1
Default 0
0
setting
PDN0
0
SEL0
1
EN0
1
0M1
0
0M0
0
LSB
1M1
0
MSB
LSB
1M0 DIV1 - - - - - 0
0
x x x x x x
first data byte
second data byte
*This bit must be set to zero.
DIV1 (bit)
This bit allows the output of the Prescaler P1 to be routed directly to the OUT1 pin (DIV1 = 1). The N
divider is bypassed so the programmed value of N is ignored. If DIV1 = 0 (default) the N divider
functions normally.
0M1, 0M0, 1M1, 1M0 (bits)
These bits set the prescalers P0 and P1, to divide by 1, 2, 4, or 8 (see Table 4).
PRESCALER DIVISOR M SETTINGS Table 4
0M1
0M0
0
0
0
Prescaler
P0 Divisor
“M”
Prescaler
P1 Divisor
“M”
1M1
1M0
1**
0
0
1**
1
2
0
1
2
1
0
4
1
0
4
1
1
8
1
1
8
**Default Condition
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DS1077
EN0 (bit)
(Default EN0 = 1)
1) If EN0 = 1 and PDN0 = 0 the CTRL0 pin functions as an Output Enable for OUT0, the frequency of
the output being determined by the SEL0 bit.
2) If PDN0 = 1, the EN0 bit is ignored, CTRL0 will function as a power-down, and output OUT0 will
always be enabled on power-up, its frequency being determined by the SEL0 bit.
3) If EN0 = 0 the function of CTRL0 is determined by the SEL0 and PDN0 bits (see Table 1).
SEL0
(Default SEL0 = 1)
1) If SEL0 = 1 and EN0 = PDN0 = 0, the CTRL0 pin determines the state of the MUX (i.e., the output
frequency of OUT0).
2) If CTRL0 = 0 the output will be the Master clock frequency.
3) If CTRL0 = 1 the output will be the output frequency of the M prescaler.
4) If either EN0 or PDN0 = 1 then SEL0 determines the frequency of OUT0 when it is enabled.
5) If SEL0 = 0 the output will be the Master clock frequency.
6) If SEL0 = 1 the output will be the output frequency of the M prescaler (see Table 1).
PDN0
(Default PDN0 = 0)
1) This bit (if set to 1) causes CTRL0 to perform a power-down function, regardless of the setting of the
other bits.
2) If PDN0 = 0 the function of CTRL0 is determined by the values of EN0 and SEL0.
NOTE:
When EN0 = SEL0 = PDN0 = 0, CTRL0 also functions as a power-down. This is a special case where all
the OUT0 circuitry is disabled even when the device is powered up for power to saving when OUT0 is
not used (see Table 1).
PDN1
(Default PDN1 = 0)
1) If PDN1 = 1, CTRL1 will function as a power-down.
2) If PDN1 = 0, CTRL1 functions as an output enable for OUT1 only (see Table 2.)
NOTE (ON OUTPUT ENABLE AND POWER-DOWN):
1) Both enables are “smart” and wait for the output to be low before going to Hi-Z.
2) Power-down sequence first disables both outputs before powering down the device.
3) On power-up the outputs are disabled until the clock has stabilized (~8000 cycles).
4) In power-down mode, the device cannot be programmed.
5) A power-down command must persist for at least two cycles of the lowest output frequency plus 10ms.
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DS1077
DIV WORD
MSB
N9 N8
N7
N6 N5 N4
first data byte
N3
LSB MSB
N2 N1 N0
X
X
X
X
second data byte
X
LSB
X
N
These ten bits determine the value of the programmable divider (N). The range of divisor values is from 2
to 1025, and is equal to the programmed value of N plus 2 (see Table 5).
PROGRAMMABLE DIVISOR N VALUES Table 5
BIT VALUE
0 000 000 000**
0 000 000 001
1 111 111 111
**Default Condition
DIVISOR (N)
2
3
1025
BUS WORD
Name
Factory Default
0*
0*
0*
*These bits are reserved and must be set to zero.
0*
WC
0
A0, A1, A2
A2
0
A1
0
A0
0
(Default Setting = 000)
These are the device select bits that determine the address of the device.
WC
(Default Setting WC = 0)
This bit determines when/if the EEPROM is written to after register contents have been changed.
If WC = 0 the EEPROM is written automatically after a write register command.
If WC = 1 the EEPROM is only written when the “WRITE ” command is issued.
Regardless of the value of the WC bit, the value of the BUS Register (A0, A1, A2) is always written
immediately to the EEPROM.
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DS1077
2-WIRE SERIAL DATA BUS
The DS1077 supports a bidirectional 2-wire bus and data transmission protocol. A device that sends data
onto the bus is defined as a transmitter, and a device receiving data as a receiver. The device that controls
the message is called a “master.” The devices that are controlled by the master are “slaves.” The bus must
be controlled by a master device that generates the serial clock (SCL), controls the bus access, and
generates the START and STOP conditions. The DS1077 operates as a slave on the 2-wire bus.
Connections to the bus are made via the open-drain I/O lines, SDA and SCL. A pull-up resistor (5kW) is
connected to SDA.
The following bus protocol has been defined (See Figure 2):
§ Data transfer may be initiated only when the bus is not busy.
§ During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes
in the data line while the clock line is high will be interpreted as control signals.
Accordingly, the following bus conditions have been defined:
Bus not busy: Both data and clock lines remain HIGH.
Start data transfer: A change in the state of the data line from HIGH to LOW while the clock is HIGH
defines a START condition.
Stop data transfer: A change in the state of the data line from LOW to HIGH while the clock line is
HIGH defines the STOP condition.
Data valid: The state of the data line represents valid data when, after a START condition, the data line is
stable for the duration of the HIGH period of the clock signal. The data on the line must be changed
during the LOW period of the clock signal. There is one clock pulse per bit of data.
Each data transfer is initiated with a START condition and terminated with a STOP condition. The
number of data bytes transferred between START and STOP conditions is not limited, and is determined
by the master device. The information is transferred byte-wise and each receiver acknowledges with a
ninth bit.
Within the bus specifications a regular mode (100kHz clock rate) and a fast mode (400kHz clock rate) are
defined. The DS1077 works in both modes.
Acknowledge: Each receiving device, when addressed, is obliged to generate an acknowledge after the
byte has been received. The master device must generate an extra clock pulse, which is associated with
this acknowledge bit.
A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a
way that the SDA line is stable LOW during the HIGH period of the acknowledge-related clock pulse. Of
course, setup and hold times must be taken into account. When the DS1077 EEPROM is being written to,
it will not be able to perform additional responses. In this case, the slave DS1077 will send a notacknowledge to any data transfer request made by the master. It will resume normal operation when the
EEPROM operation is complete.
A master must signal an end-of-data to the slave by not generating an acknowledge bit on the last byte
that has been clocked out of the slave. In this case, the slave must leave the data line HIGH to enable the
master to generate the STOP condition.
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DS1077
DATA TRANSFER ON 2-WIRE SERIAL BUS Figure 2
SDA
MSB
slave address
R/W
direction
bit
acknowledgement
signal from receiver
acknowledgement
signal from receiver
SCL
1
START
CONDITION
2
6
7
8
9
1
2
3-8
ACK
8
9
ACK
repeated if more bytes
are transferred
STOP CONDITION
OR
REPEATED
START CONDITION
Figure 2 details how data transfer is accomplished on the 2-wire bus. Depending upon the state of the
R/ W bit, two types of data transfer are possible:
1) Data transfer from a master transmitter to a slave receiver. The first byte transmitted by the
master is the slave address. Next, follows a number of data bytes. The slave returns an acknowledge
bit after each received byte.
2) Data transfer from a slave transmitter to a master receiver. The first byte (the slave address) is
transmitted by the master. The slave then returns an acknowledge bit. Next, follows a number of data
bytes transmitted by the slave to the master. The master returns an acknowledge bit after all received
bytes other than the last byte. At the end of the last received byte, a not acknowledge is returned.
The master device generates all of the serial clock pulses and the START and STOP conditions. A
transfer is ended with a STOP condition or with a repeated START condition. Since a repeated START
condition is also the beginning of the next serial transfer, the bus will not be released.
The DS1077 may operate in the following two modes:
1) Slave receiver mode: Serial data and clock are received through SDA and SCL. After each byte is
received, an acknowledge bit is transmitted. START and STOP conditions are recognized as the
beginning and end of a serial transfer. Address recognition is performed by hardware after the slave
address and direction bit have been received.
2) Slave transmitter mode: The first byte is received and handled as in the slave receiver mode.
However, in this mode, the direction bit will indicate that the transfer direction is reversed. Serial data
is transmitted on SDA by the DS1077 while the serial clock is input on SCL. START and STOP
conditions are recognized as the beginning and end of a serial transfer.
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DS1077
SLAVE ADDRESS
A control byte is the first byte received following the START condition from the master device. The
control byte consists of a 4-bit control code; for the DS1077, this is set as 1011 binary for read and write
operations. The next three bits of the control byte are the device select bits (A2, A1, A0) and can be
written to the EEPROM. They are used by the master device to select which of eight devices are to be
accessed. The select bits are in effect the three least significant bits of the slave address. The last bit of the
control byte (R/ W ) defines the operation to be performed. When set to a one a read operation is selected,
and when set to a zero, a write operation is selected. Following the START condition, the DS1077
monitors the SDA bus, checking the device type identifier being transmitted. Upon receiving the 1011
code (changeable with one mask) and appropriate device select bits, the slave device outputs an
acknowledge signal on the SDA line.
10 of 21
DS1077
2-WIRE SERIAL COMMUNICATION WITH DS1077 Figure 3
Send a “Standalone” Command
SCL
SDA
S
1
Start
0
1 1
A2 A1 A0 W
Address Byte
A
C7 C6 C5 C4 C3 C2 C1 C0
DS1077
ACK
Command Byte
A
P
DS1077 Stop
ACK
Write MSB of a Two-Byte Register
SCL
SDA
S
1
0
Start
1 1
A2 A1 A0 W
Address Byte
A
C7 C6 C5 C4 C3 C2 C1 C0
DS1077
ACK
Command Byte
A
D7 D6 D5 D4 D3 D2 D1 D0
DS1077
ACK
MSByte
A
P
DS1077 Stop
ACK
Write to a Two-Byte Register
SCL
SDA
S
1
0
Start
1 1
A2 A1 A0 W
Address Byte
A
C7 C6 C5 C4 C3 C2 C1 C0
DS1077
ACK
Command Byte
A
D7 D6 D5 D4 D3 D2 D1 D0
DS1077
ACK
MSByte
A
D7 D6 D5 D4 D3 D2 D1 D0
DS1077
ACK
LSByte
A
P
DS1077 Stop
ACK
Write a Single Byte to an Addressed Register
SCL
SDA
S
1
0
Start
1 1
A2 A1 A0
W
Control Byte
A
C7 C6 C5 C4 C3 C2 C1 C0
DS1077
ACK
Command Byte
A
A7 A6 A5 A4 A3 A2 A1 A0
DS1077
ACK
Byte Address
A
D7 D6 D5 D4 D3 D2 D1 D0
DS1077
ACK
Data Byte
A
DS1077 Stop
ACK
Write Multiple Bytes to an Addressed Register
SCL
SDA
S
Start
1
0
1 1
A2 A1 A0 W
Control Byte
A
C7 C6 C5 C4 C3 C2 C1 C0
DS1077
ACK
Command Byte
A
A7 A6 A5 A4 A3 A2 A1 A0
DS1077
ACK
Starting Byte Address
SCL
SDA
D7 D6 D5 D4 D3 D2 D1 D0
Byte (n+1)
A
D7 D6 D5 D4 D3 D2 D1 D0
DS1077
ACK
Byte N
A
P
DS1077 Stop
ACK
11 of 21
A
D7 D6 D5 D4 D3 D2 D1 D0
DS1077
ACK
Byte n
P
A
DS1077
ACK
DS1077
2-WIRE SERIAL COMMUNICATION WITH DS1077 Figure 3 (continued)
Read Single Byte Register or MSB from a Two-Byte Register
SCL
SDA
S
1
0
Start
1
1
A2 A1 A0
W
Control Byte
A
C7 C6 C5 C4 C3 C2 C1 C0
DS1077
ACK
Command Byte
A
R 1
0
1
1
A2 A1 A0 Rd
DS1077 Repeated Control Byte
ACK
Start
A
D7 D6 D5 D4 D3 D2 D1 D0
DS1077
ACK
MSByte
N
Master Stop
NACK
Read from a Two-Byte Register
SCL
SDA
S
1
0
Start
1
1
A2 A1 A0
W
Control Byte
A
C7 C6 C5 C4 C3 C2 C1 C0
DS1077
ACK
Command Byte
A
R 1
0
1
1
A2 A1 A0 Rd
DS1077 Repeated Control Byte
ACK
Start
A
D7 D6 D5 D4 D3 D2 D1 D0
DS1077
ACK
MSByte
A
Master
ACK
SCL
D7 D6 D5 D4 D3 D2 D1 D0
SDA
LSByte
N
P
Master Stop
NACK
Read Multiple Bytes from an Addressed Register
SCL
SDA
S
1
Start
0
1
1
A2 A1 A0
W
Control Byte
A
C7 C6 C5 C4 C3 C2 C1 C0
DS1077
ACK
Command Byte
A
A7 A6 A5 A4 A3 A2 A1 A0
DS1077
ACK
A
R 1
0
1
1
A2 A1 A0 Rd
Starting Byte Address DS1077 Repeated Control Byte
ACK
Start
SCL
SDA
D7 D6 D5 D4 D3 D2 D1 D0
Byte n
A D7 D6 D5 D4 D3 D2 D1 D0
Master
ACK
Byte (n+1)
A
D7 D6 D5 D4 D3 D2 D1 D0
Master
ACK
Byte N
12 of 21
N
P
Master Stop
NACK
P
A
DS1077
ACK
DS1077
COMMAND SET
Data and control information is read from and written to the DS1077 in the format shown in Figure 3. To
write to the DS1077, the master will issue the slave address of the DS1077 and the R/ W bit will be set to 0.
After receiving an acknowledge, the bus master provides a command protocol. After receiving this protocol,
the DS1077 will issue an acknowledge, and then the master may send data to the DS1077. If the DS1077 is
to be read, the master must send the command protocol as before, and then issue a repeat START condition
and then the control byte again, this time with the R/W bit set to 1 to allow reading of the data from the
DS1077. The command set for the DS1077 is as follows:
Access DIV [01]
If R/ W is 0, this command writes to the DIV register. After issuing this command, the next data byte value
is to be written into the DIV register.
If R/ W is 1, the next data byte read is the value stored in the DIV register.
Access MUX [02]
If R/ W is 0, this command writes to the MUX register. After issuing this command, the next data byte value
is to be written into the MUX register.
If R/ W is 1, the next data byte read is the value stored in the MUX register.
Access BUS [0D]
If R/ W is 0, this command writes to the BUS register. After issuing this command, the next data byte value
is to be written into the BUS register.
If R/ W is 1, the next data byte read is the value stored in the BUS register.
Write E2 [3F]
If WC = 0 the EEPROM is automatically written to at the end of each command. This is a DEFAULT
condition. In this case the command WRITE E2 is not needed.
If WC = 1, the EEPROM is only written when the WRITE E2 command is issued. On receipt of the WRITE
E2 command the contents of the DIV and MUX registers are written into the EEPROM, thus locking in the
register settings.
EXCEPTION: The bus register is always automatically written to EEPROM after a write, regardless of the
value of WC.
APPLICATION INFORMATION
Power-Supply Decoupling
To achieve best results, decouple the power supply with 0.01µF and 0.1µF high-quality, ceramic, surfacemount capacitors as close as possible to VCC/GND of the device. Surface-mount components minimize lead
inductance, which improves performance, and ceramic capacitors tend to have adequate high-frequency
response for decoupling applications.
Current Consumption
The active supply current can be significantly reduced by disabling OUT0 when not required and setting its
prescaler to divide by 8. Likewise, bypassing OUT1’s divider (and using only the prescaler) also
significantly reduces the supply current.
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DS1077
ABSOLUTE MAXIMUM RATINGS
Voltage on Any Pin Relative to Ground
Operating Temperature Range
Programming Temperature Range
Storage Temperature Range
Soldering Temperature
-0.5V to 6.0V
-40°C to +85°C
0°C to +70°C
-55°C to +125°C
See IPC/JEDEC J-STD-020A Specification
DC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
Supply Voltage
VCC
High-Level Output
Voltage
(OUT1,OUT0)
Low-Level Output
Voltage
(OUT1,OUT0)
High-Level Input
Voltage (CTRL1,
CTRL0)
High-Level Input
Voltage (SDA, SCL)
Low-Level Input
Voltage
(CTRL1, CTRL0)
Low-Level Input
Voltage
(SDA, SCL)
High-Level Input
Current
(CTRL1, CTRL0,
SDA, SCL)
Low-Level Input
Current
(CTRL1, CTRL0,
SDA, SCL)
Supply Current
(Active)
Standby Current
(Power-Down)
CONDITION
VOH
IOH = -4mA,
VCC = min
VOL
IOL = 4mA
(TA = -40°C to +85°C, VCC = 5V ±5%)
MIN
TYP
MAX
UNITS
NOTES
4.75
5
5.25
V
1
2.4
V
0.4
V
VIH
2.1
VCC+
0.3V
V
VIH
0.7Vcc
VCC+
0.3V
V
VIL
-0.3V
0.8
V
VIL
-0.3V
0.3Vcc
IIH
VIH = VCC =
5.25V
1
µA
IIL
VCC = 5.25V,
VIL= 0
ICC
ICCQ
CL = 15pF
(Both Outputs)
(-40°C to +85°C)
Power-Down
Mode
14 of 21
-1
µA
2
50
mA
5
µA
10
DS1077
AC ELECTRICAL CHARACTERISTICS
PARAMETER
Output Frequency
Tolerance Over
Temperature
SYMBOL
∆fO
Output Frequency
Tolerance Over Voltage
∆fO
Combined Freq. Variation
∆fO
Output Frequency Min
Output Frequency Max
fOUT
(TA = -40°C to +85°C; VCC = 5V ±5%)
CONDITION
MIN
TYP
MAX
VCC = 5V, 25°C
-0.5
0
+0.5
VCC = 5V, 70°C
-0.5
0
+0.5
VCC = 5V,
-3.3
-40°C to +25°C
VCC = 5V,
-1.4
+25°C to +85°C
VCC = 4.75V,
-1.0
25°C
VCC = 5.25V,
25°C
Over Temp
(0°C to +70°C) -1.65
& Voltage
8.13
+2.7
UNITS
NOTES
%
11
+1.4
-0.7
%
+0.7
+1.0
+1.25
%
133
kHz
MHz
2
Power-Up Time
tPOR +
tSTAB
0.1
1
ms
5
Enable OUT1 from PDN
tSTAB
0.1
1
ms
3
Enable OUT0 from PDN
tSTAB
0.1
1
ms
3
OUT1 Hi-Z from PDN
tHiZ
1
ms
3
OUT0 Hi-Z from PDN
tHiZ
1
ms
3
Load Capacitance
CL
50
pF
4
60
%
15
Output Duty Cycle
(OUT1, OUT0)
Output Jitter
40
fOUT=133MHz
M=1; DIV1=1
CL=12pF
3 sigma pk-topk
15 of 21
30
psec
DS1077
AC ELECTRICAL CHARACTERISTICS: 2-WIRE INTERFACE
(-40°C to +85°C; VCC= 5V±5%)
PARAMETER
SYMBOL
CONDITION
SCL Clock Frequency
fSCL
Bus Free Time
Between a STOP
and START Condition
Hold Time (Repeated)
START Condition
LOW Period of SCL
tBUF
Fast Mode
Standard Mode
Fast Mode
Standard Mode
tHD:STA
tLOW
HIGH Period of SCL
tHIGH
Set-Up Time for a
Repeated START
Data Hold Time
tSU:STA
tHD:DAT
Data Set-Up Time
tSU:DAT
Rise Time of Both
SDA and SCL Signals
Fall Time of Both SDA
and SCL Signals
Set-Up Time For STOP
Capacitive Load for
Each Bus Line
Input Capacitance
tR
tF
tSU:STO
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
MIN
TYP MAX
400
100
UNITS
NOTES
kHz
1.3
4.7
µs
0.6
4.0
1.3
4.7
0.6
4.0
0.6
4.7
0
0
100
250
µs
6
µs
µs
µs
0.9
µs
7,8
ns
300
1000
300
20 + 0.1CB
20 + 0.1CB
0.6
4.0
ns
9
ns
9
µs
CB
400
CI
5
pF
9
pF
NONVOLATILE MEMORY CHARACTERISTICS
PARAMETER
Writes
SYMBOL
CONDITION
+85°C
MIN
10,000
TYP
MAX
UNITS
NOTES
NOTES:
1)
2)
3)
4)
5)
6)
All voltages are referenced to ground.
8.13kHz is obtained from a -66MHz standard part.
PDN is a power-down signal applied to either CTRL0 or CTRL1 pins as appropriate.
Output voltage swings may be impaired at high frequencies combined with high output loading.
After this period, the first clock pulse is generated.
A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIH MIN
of the SCL signal) in order to bridge the undefined region of the falling edge of SCL.
7) The maximum tHD:DAT has only to be met if the device does not stretch the LOW period (tLOW) of the SCL
signal.
16 of 21
DS1077
8) A fast mode device can be used in a standard mode system, but the requirement tSU:DAT>250ns must then
be met. This will automatically be the case if the device does not stretch the LOW period of the SCL
signal. If such a device does stretch the LOW period of the SCL signal, it must output the next data bit to
the SDA line tR MAX + tSU:DAT = 1000ns + 250ns = 1250ns before the SCL line is released.
9) CB is the total capacitance of one bus line in pF.
10) OUT0 and OUT1 are operating at oscillator master frequency without divider.
11) Typical frequency shift due to aging is ±0.5%. Aging stressing includes Level 3 preconditioning with
1000 temperature cycles of -55°C to +125°C, 336hr max VCC biased +125°C bake. Level 3
preconditioning consists of a 24hr +125°C storage bake, 192hr moisture soak at +30°C/60% R.H., and
three solder reflow passes.
TIMING DIAGRAM
SDA
tBUF
tLOW
tHD:STA
tR
tF
t SP
SCL
t HD:STA
STOP
START
t HD:DAT
tHIGH
t SU:DAT
t SU:STO
t SU:STA
REPEATED
START
ORDERING INFORMATION
DS1077
133 =
125 =
120 =
100 =
66 =
133.333MHz
125.000MHz
120.000MHz
100.000MHz
66.666MHz
Z=
U=
SO
µSOP
Example:
DS1077Z-100
17 of 21
DS1077
TYPICAL OPERATING CHARACTERISTICS
(VCC = 5.0V, T = +25°C, unless otherwise specified)
SUPPLY CURRENT vs. VOLTAGE
45.00
40.00
CURRENT (mA)
35.00
30.00
25.00
20.00
15.00
DS1077-133
10.00
DS1077-100
5.00
DS1077-66
0.00
4.5
4.7
4.9
5.1
5.3
5.5
VOLTAGE (V)
SUPPLY CURRENT vs. DIVISOR (N)
DS1077-133
34
32
CURRENT (mA)
30
28
26
24
4.75V
5.0V
22
5.25V
20
0
200
400
600
800
DIVISOR (N)
18 of 21
1000
DS1077
TYPICAL OPERATING CHARACTERISTICS (continued)
(VCC = 5.0V, T = +25°C, unless otherwise specified)
SUPPLY CURRENT vs. DIVISOR (N)
35
30
CURRENT (mA)
25
20
15
10
DS1077-133
DS1077-100
5
DS1077-66
0
0
200
400
600
800
1000
DIVISOR (N)
SUPPLY CURRENT vs. TEMPERATURE
45
CURRENT (mA)
40
35
30
DS1077-133
DS1077-100
25
DS1077-66
20
0
10
20
30
40
50
TEMPERAT URE (C)
19 of 21
60
70
DS1077
TYPICAL OPERATING CHARACTERISTICS (continued)
(VCC = 5.0V, T = +25°C, unless otherwise specified)
TEMPCO
2
1.5
% Change from 25C
1
0.5
0
-0.5
DS1077-133
DS1077-100
-1
DS1077-66
MUX=3040h
DIV=0000h
-1.5
-2
0
10
20
30
40
50
60
70
TEMPERAT URE (C)
VOLTCO
2.00
% CHANGE FROM 5V
1.50
1.00
0.50
0.00
-0.50
DS1077-133
-1.00
-1.50
DS1077-100
MUX=3040h
DIV=0000h
DS1077-66
-2.00
4.75
4.85
4.95
5.05
VOLTAGE (V)
20 of 21
5.15
5.25
DS1077
TYPICAL OPERATING CHARACTERISTICS (continued)
(VCC = 5.0V, T = +25°C, unless otherwise specified)
SHUTDOWN CURRENT vs. TEMPERATURE
4
3.5
CURRENT (µA)
3
2.5
2
1.5
DS1077-66
1
0.5
0
0
10
20
30
40
T EMPERAT URE (C)
21 of 21
50
60
70