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840272AGILF Datasheet(PDF) 2 Page - Integrated Device Technology |
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840272AGILF Datasheet(HTML) 2 Page - Integrated Device Technology |
2 / 15 page ICS840272AGI REVISION A JULY 26, 2010 2 ©2010 Integrated Device Technology, Inc. ICS840272I Data Sheet SYNCHRONOUS ETHERNET FREQUENCY TRANSLATOR Table 1. Pin Descriptions NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values. Table 2. Pin Characteristics Number Name Type Description 1VDD Power Core supply pin. 2 LOCK_DT Output Lock detect. Logic HIGH when PLL is locked. 3 REF_SEL Input Pulldown Selects the input reference clock. When LOW, selects CLK0, nCLK0. When HIGH, selects CLK1, nCLK1. LVCMOS/LVTTL interface levels. 4 SEL0 Input Pullup Selects the input reference frequency and the PLL bypass mode. See Table 3A. LVCMOS/LVTTL interface levels. 5 SEL1 Input Pulldown Selects the input reference frequency and the PLL bypass mode. See Table 3A. LVCMOS/LVTTL interface levels. 6 OE Input Pulldown 8kHz output enable pin. When LOW, QB is disabled. When HIGH, QB is enabled. LVCMOS/LVTTL interface levels. See Table 3B. 7VDDA Power Analog supply pin. 8, 13 GND Power Power supply ground. 9 nCLK1 Input Pullup/ Pulldown Inverting differential clock input. Internal resistor bias to VDD/2. 10 CLK1 Input Pulldown Non-inverting differential clock input. 11 nCLK0 Input Pullup/ Pulldown Inverting differential clock input. Internal resistor bias to VDD/2. 12 CLK0 Input Pulldown Non-inverting differential clock input. 14 QB Output Single-ended clock output. LVCMOS/LVTTL interface levels. 15 QA Output Single-ended clock output. LVCMOS/LVTTL interface levels. 16 VDDO Power Output supply pin. Symbol Parameter Test Conditions Minimum Typical Maximum Units CIN Input Capacitance 4pF RPULLUP Input Pullup Resistor 51 k Ω RPULLDOWN Input Pulldown Resistor 51 k Ω ROUT Output Impedance VDDO = 3.465V 17 Ω |
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