PCX7457VGH1000NC Atmel, PCX7457VGH1000NC Datasheet - Page 52

• Manufacturer Part Number: PCX7457VGH1000NC
• Description: IC MPU 32BIT 1000MHZ 483CBGA
• Manufacturer: Atmel

Specifications of PCX7457VGH1000NC

• Processor Type: PowerPC 32-Bit RISC
• Speed: 1.0GHz
• Voltage: 1.1V
• Mounting Type: Surface Mount
• Package / Case: 483-CBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

15.6
52
Pull-up/Pull-down Resistor Requirements
PC7457
Figure 15-2. Driver Impedance Measurement
Table 15-4
temperature and is relatively unaffected by bus voltage.
Table 15-4.
The PC7457 requires high-resistive (weak: 4.7 k ) pull-up resistors on several control pins of
the bus interface to maintain the control signals in the negated state after they have been
actively negated and released by the PC7457 or other bus masters. These pins are TS, ARTRY,
SHDO, and SHD1.
Some pins designated as being for factory test must be pulled up to OVDD or down to GND to
ensure proper device operation. For the PC7447, 360 BGA, the pins that must be pulled up to
OVDD are LSSD_MODE and TEST[0:3]; the pins that must be pulled down to GND are
L1_TSTCLK and TEST[4]. For the PC7457, 483 BGA, the pins that must be pulled up to OVDD
are LSSD_MODE and TEST[0:5]; the pins that must be pulled down are L1_TSTCLK and
TEST[6]. The CKSTP_IN signal should likewise be pulled up through a pull-up resistor (weak or
stronger: 4.7 – 1 k ) to prevent erroneous assertions of this signal. In addition, the PC7457 has
one open-drain style output that requires a pull-up resistor (weak or stronger: 4.7 – 1 k ) if it is
used by the system. This pin is CKSTP_OUT.
If pull-down resistors are used to configure BVSEL or L3VSEL, the resistors should be less than
250 . Because PLL_CFG[0:4] must remain stable during normal operation, strong pull-up and
pull-down resistors (1 k or less) are recommended to configure these signals in order to protect
against erroneous switching due to ground bounce, power supply noise or noise coupling.
Z
0
summarizes the signal impedance results. The impedance increases with junction
Impedance
Impedance Characteristics with V
Maximum
Typical
Data
Processor bus
33 – 42
31 – 51
DD
RP
= 1.5V, OV
RN
Pad
OGND
OV
DD
SW2
SW1
DD
= 1.8V ±5%, T
L3 Bus
34 – 42
32 – 44
J
5345D–HIREL–07/06
= 5 - 85 C
Unit