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| Part Number | P87C661X2BBD,157 | P87C660X2BBD,157 | 
|---|---|---|
| Manufacturer | NXP USA Inc. | NXP USA Inc. | 
| Product Status | Obsolete | Obsolete | 
| Core Processor | 8051 | 8051 | 
| Core Size | 8-Bit | 8-Bit | 
| Speed | 33MHz | 33MHz | 
| Connectivity | EBI/EMI, I²C, UART/USART | EBI/EMI, I²C, UART/USART | 
| Peripherals | POR, PWM, WDT | POR, PWM, WDT | 
| Number of I/O | 32 | 32 | 
| Program Memory Size | 16KB (16K x 8) | 16KB (16K x 8) | 
| Program Memory Type | OTP | OTP | 
| EEPROM Size | - | - | 
| RAM Size | 512 x 8 | 512 x 8 | 
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 
| Data Converters | - | - | 
| Oscillator Type | Internal | Internal | 
| Operating Temperature | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 44-LQFP | 44-LQFP | 
| Supplier Device Package | 44-LQFP (10x10) | 44-LQFP (10x10) |